There are 621 thirteen-letter words containing A, D, E, L and T, https://www.bestwordlist.com/c/a/5/13letterwordswithadelt.htm
ABSQUATULATED ACCIDENTALISM ACCIDENTALITY ACCIDENTOLOGY ACETALDEHYDES
ACETAZOLAMIDE ACIDIMETRICAL ACOTYLEDONOUS ADAPTABLENESS ADMINICULATED
ADMINICULATES ADMINISTRABLE ADORABILITIES ADRENALECTOMY ADULTERATIONS
ADUMBRATIVELY ADVANTAGEABLE ADVENTUROUSLY ADVERSATIVELY ALDERMANITIES
ALDERMANLIEST ALDOSTERONISM ANDOUILLETTES ANECDOTALISMS ANECDOTALISTS
ANECDOTICALLY ANTEDILUVIANS ANTIDIARRHEAL APFELSTRUDELS APPENDICULATE
ASYNDETICALLY AUTOCATALYSED AUTOCATALYZED BACTERIOCIDAL BATTLEDRESSES
BATTLEGROUNDS BEDAZZLEMENTS BEETLEBRAINED BELATEDNESSES BENEDICTIONAL
BIDDABILITIES BIDIRECTIONAL BIOPESTICIDAL BLANDISHMENTS BLOATEDNESSES
BRILLIANTINED BUTYRALDEHYDE CANALICULATED CANDLELIGHTED CANDLELIGHTER
CARDINALITIES CENTUPLICATED CLAIRAUDIENTS CLANDESTINELY CLANDESTINITY
CODECLINATION COEDUCATIONAL COLDHEARTEDLY COMPLICATEDLY CONCELEBRATED
CONDITIONABLE CONGLOBULATED CONGLOMERATED CONGLUTINATED CONGRATULATED
CONSIDERATELY CONSOLIDATIVE CONSTRAINEDLY CORESIDENTIAL COUNTERPLAYED
COUNTERPLEADS COUNTERSEALED COUNTERVAILED CREDENTIALING CREDENTIALISM
CREDENTIALLED CREDITABILITY CYCLANDELATES CYCLOPAEDISTS DACTYLOLOGIES
DAMAGEABILITY DAMNABILITIES DASTARDLINESS DATAVEILLANCE DAUGHTERLIEST
DAUGHTERLINGS DAUNTLESSNESS DEARTICULATED DEARTICULATES DEATHLESSNESS
DEATHLINESSES DEBILITATIONS DECAPITALISED DECAPITALISES DECAPITALIZED
DECAPITALIZES DECAPSULATING DECAPSULATION DECARBOXYLATE DECARTELISING
DECARTELIZING DECEIVABILITY DECELERATIONS DECENTRALISED DECENTRALISES
DECENTRALISTS DECENTRALIZED DECENTRALIZES DECHLORINATED DECHLORINATES
DECLAMATORILY DECLARATIVELY DECLARATORILY DECLINATIONAL DECLINATORIES
DECOLORATIONS DECUMULATIONS DEDUPLICATING DEDUPLICATION DEERSTALKINGS
DEFEASIBILITY DEFERENTIALLY DEFIBRILLATED DEFIBRILLATES DEFIBRILLATOR
DEFLAGRATIONS DEFLATIONISTS DEFLOCCULANTS DEFLOCCULATED DEFLOCCULATES
DEFORMABILITY DEFORMATIONAL DEGLACIATIONS DEGLUTINATING DEGLUTINATION
DEGRADABILITY DEGRANULATION DELAMINATIONS DELECTABILITY DELEGITIMATED
DELEGITIMATES DELIBERATIONS DELICATESSENS DELIMITATIONS DELIRIFACIENT
DEMATERIALISE DEMATERIALIZE DEMETHYLATING DEMETHYLATION DEMILITARISED
DEMILITARISES DEMILITARIZED DEMILITARIZES DEMODULATIONS DEMONOLATRIES
DEMUTUALISING DEMUTUALIZING DEMYELINATING DEMYELINATION DENATIONALISE
DENATIONALIZE DENATURALISED DENATURALISES DENATURALIZED DENATURALIZES
DENDRITICALLY DENDROLATRIES DENIABILITIES DENTICULATELY DENTICULATION
DENTILINGUALS DEONTOLOGICAL DEOPPILATIONS DEOPPILATIVES DEPENDABILITY
DEPHLEGMATING DEPHLEGMATION DEPHLEGMATORS DEPLORABILITY DEPOPULATIONS
DEPRECATINGLY DEPRECATIVELY DEPRECATORILY DEREALISATION DEREALIZATION
DEREGULATIONS DERMATOLOGIES DERMATOLOGIST DERMATOPLASTY DESALINATIONS
DESOBLIGEANTE DESPICABILITY DESPOLIATIONS DESTABILISERS DESTABILISING
DESTABILIZERS DESTABILIZING DESTRUCTIONAL DESULFURATING DESULFURATION
DESULPHURATED DESULPHURATES DETACHABILITY DETECTABILITY DETERMINANTAL
DETERMINATELY DETERRABILITY DETESTABILITY DETRIBALISING DETRIBALIZING
DETRIMENTALLY DEUTERANOMALY DEUTEROPLASMS DEVASTATINGLY DEVELOPMENTAL
DEVOLUTIONARY DEVOTIONALIST DEVOTIONALITY DIABETOLOGIST DIALECTICALLY
DIALECTICIANS DIALECTICISMS DIALYPETALOUS DIAMETRICALLY DICHLORACETIC
DIESELISATION DIESELIZATION DIETHYLAMIDES DIETHYLAMINES DIFFERENTIALS
DIFFRACTIVELY DILACERATIONS DILATABLENESS DILATOMETRIES DILETTANTEISH
DILETTANTEISM DILETTANTISMS DIMETHYLAMINE DIOTHELETICAL DIPROPELLANTS
DIRECTORIALLY DISAFFECTEDLY DISAFFILIATED DISAFFILIATES DISANNULMENTS
DISARTICULATE DISASSIMILATE DISCREDITABLE DISCREDITABLY DISENABLEMENT
DISENTAILMENT DISENTANGLING DISENTHRALLED DISENTRAILING DISENTRAYLING
DISHABILITATE DISILLUMINATE DISINTEGRABLE DISINTHRALLED DISMANTLEMENT
DISNATURALISE DISNATURALIZE DISORDINATELY DISPLACEMENTS DISPLEASANTED
DISPUTATIVELY DISSEPIMENTAL DISSIMILATIVE DISSIMULATIVE DISTASTEFULLY
DISTRACTIVELY DISTRIBUTABLE DIVELLICATING DIVERTICULATE DOCUMENTALIST
DOCUMENTARILY DOGMATOLOGIES DOWNHEARTEDLY DRAGGLETAILED DRAPABILITIES
DRIVABILITIES DUTIABILITIES DYOTHELETICAL DYOTHELITICAL DYSPEPTICALLY
EDITORIALISED EDITORIALISER EDITORIALISES EDITORIALISTS EDITORIALIZED
EDITORIALIZER EDITORIALIZES EDUCABILITIES EDUCATABILITY EDUCATIONALLY
EDULCORATIONS ELECTRODERMAL ELECTROPLATED EMOTIONALISED EMOTIONALIZED
ENDOLYMPHATIC ENDOTHELIOMAS EQUIDISTANTLY ESSENTIALISED ESSENTIALIZED
EUDIOMETRICAL EXAGGERATEDLY EXALTEDNESSES EXASPERATEDLY EXCLUDABILITY
EXPANDABILITY EXPENDABILITY EXTENDABILITY EXTRAJUDICIAL EXTRUDABILITY
FACTIONALISED FACTIONALIZED FELDSPATHOIDS FEUDALISATION FEUDALIZATION
FICTIONALISED FICTIONALIZED FLABBERGASTED FLUIDEXTRACTS FLUTTERBOARDS
FREEHEARTEDLY FUNDAMENTALLY GALACTOSIDASE GANGSTERLANDS GENTLEMANHOOD
GILLRAVITCHED GRADABILITIES GRANDFATHERLY GRANDILOQUENT GRANDMOTHERLY
GRANDPARENTAL HAEMODILUTION HALFHEARTEDLY HARDHEARTEDLY HETERODACTYLS
HEXACTINELLID HEXADACTYLOUS HYDROMETRICAL HYDROSULPHATE HYPERINFLATED
IDEALISATIONS IDEALIZATIONS IDENTICALNESS IDIOTICALNESS ILLEGITIMATED
INADVERTENTLY INDEFATIGABLE INDEFATIGABLY INDUSTRIALISE INDUSTRIALIZE
INEDUCABILITY INFUNDIBULATE INTERDENTALLY INTERFOLIATED INTERLINEATED
INTERPELLATED INTERPLEADERS INTERPLEADING INTERRADIALLY INTERSIDEREAL
INTERSTADIALS INTOXICATEDLY INTRADERMALLY JUDGEMENTALLY KINDHEARTEDLY
LANDGRAVIATES LAUDABILITIES LEGITIMATISED LEGITIMATIZED LEPIDOPTERANS
LEUCOPLASTIDS LOATHEDNESSES LYMPHADENITIS MALADAPTIVELY MALADJUSTMENT
MALADMINISTER MALADROITNESS MALDEPLOYMENT MALFUNCTIONED MALTODEXTRINS
MEDIAEVALISTS MEDIATORIALLY MEDIEVALISTIC MELODRAMATICS MELODRAMATISE
MELODRAMATIST MELODRAMATIZE MERIDIONALITY METRONIDAZOLE MISCALCULATED
MISCATALOGUED MISTRANSLATED MOLDABILITIES MONONUCLEATED MULTIAUTHORED
MULTIBARRELED MULTIBRANCHED MULTIDIGITATE MULTIFEATURED MULTIGRAVIDAE
MULTIRAMIFIED MULTISTRANDED MULTITALENTED MULTIWARHEADS NEANDERTALERS
NEANDERTHALER NEARSIGHTEDLY NONACCIDENTAL NONAFFILIATED NONCULTIVATED
NONDELIBERATE NONDEPLETABLE NONDETACHABLE NONEDITORIALS NONINDICTABLE
NONINTERLACED NONJUDGMENTAL NONMYELINATED NONVALIDITIES NUCLEOTIDASES
OCCIDENTALISE OCCIDENTALISM OCCIDENTALIST OCCIDENTALIZE ODONATOLOGIES
OPENHEARTEDLY OPINIONATEDLY ORTHOPAEDICAL OUTGENERALLED OVEREVALUATED
OVERPOPULATED OVERREGULATED PALLIDOTOMIES PALUDAMENTUMS PAMPHLETEERED
PARTICLEBOARD PARTICOLOURED PEDICULATIONS PEDUNCULATION PENTADACTYLES
PENTADACTYLIC PENTADELPHOUS PENTAPLOIDIES PEPTIDOGLYCAN PERDITIONABLE
PERDURABILITY PERIODICALIST PERIODONTALLY PERISSODACTYL PICTORIALISED
PICTORIALIZED PLASMODESMATA PLASTERBOARDS PLATITUDINISE PLATITUDINIZE
POLITICALISED POLITICALIZED POLYBUTADIENE POLYDACTYLIES PONDERABILITY
PRAEDIALITIES PREADOLESCENT PREADULTHOODS PREDESTINABLE PREDICABILITY
PREDICAMENTAL PREDICATIVELY PREDOMINANTLY PREDOMINATELY PREFORMULATED
PREINDUSTRIAL PROBLEMATIZED PROCATHEDRALS PRODIGALITIES PROGLOTTIDEAN
PRUDENTIALISM PRUDENTIALIST PRUDENTIALITY PTERODACTYLES QUADRIFOLIATE
QUADRILATERAL QUADRILITERAL QUADRIVALENTS QUADRUPLICATE QUINDECAPLETS
QUODLIBETICAL RADIATIONLESS RADIOACTIVELY RADIOELEMENTS RADIOTELEGRAM
RADIOTELETYPE RATTLEBRAINED REACCELERATED READABILITIES REARTICULATED
RECALCITRATED RECAPITALISED RECAPITALIZED RECAPITULATED RECENTRALIZED
RECONSOLIDATE REDEEMABILITY REDUPLICATING REDUPLICATION REDUPLICATIVE
REESTABLISHED REFUNDABILITY REHABILITATED RELATEDNESSES REMEDIABILITY
REMILITARISED REMILITARIZED RESIDENTIALLY REVALIDATIONS ROADABILITIES
RUDIMENTARILY SACERDOTALISE SACERDOTALISM SACERDOTALIST SACERDOTALIZE
SCLERODERMATA SCROBICULATED SECTIONALISED SECTIONALIZED SEDIMENTARILY
SEXTUPLICATED SLUGGARDLIEST SOFTHEARTEDLY SOLDERABILITY SOLIDUNGULATE
SOMNAMBULATED SPERMATOCIDAL SPIRITUALISED SPIRITUALIZED SPLAYFOOTEDLY
SPREADABILITY STADDLESTONES STADHOLDERATE STAKEHOLDINGS STAPHYLINIDAE
STEAMROLLERED STEEPLECHASED STICKHANDLERS STRAIGHTLACED STRAITLACEDLY
STRANGLEHOLDS STROPHIOLATED SUBADOLESCENT SUBORDINATELY SULFACETAMIDE
SUMMERSAULTED SUPERDELEGATE SUPERDIPLOMAT SUPERELEVATED SUPEROVULATED
SYNADELPHITES TECHNICALISED TECHNICALIZED TETARTOHEDRAL TETRACHLORIDE
TETRAFLUORIDE TETRAHEDRALLY TETRAPLOIDIES THIABENDAZOLE TRADESMANLIKE
TRADESPEOPLES TRADITIONLESS TRANQUILLISED TRANQUILLIZED TRANSDERMALLY
TRANSPORTEDLY TRANSVALUATED TRAPEZOHEDRAL TYNDALLIMETRY ULTRADISTANCE
ULTRAFILTERED ULTRARAREFIED ULTRAWIDEBAND UNADULTERATED UNARTICULATED
UNASSIMILATED UNCAPITALISED UNCAPITALIZED UNCHLORINATED UNCOMPLICATED
UNDERBLANKETS UNDERINFLATED UNDERLAYMENTS UNDERPLANTING UNDERSTATEDLY
UNDEVIATINGLY UNDIALECTICAL UNESTABLISHED UNILLUMINATED UNILLUSTRATED
UNMANIPULATED UNMETABOLISED UNMETABOLIZED UNMITIGATEDLY UNNATURALISED
UNNATURALIZED UNPLASTICISED UNPLASTICIZED UNPREDICTABLE UNPREDICTABLY
UNPUTDOWNABLE UNREADABILITY UNSTEADFASTLY UNWARRANTEDLY VALEDICTORIAN
VALEDICTORIES VAUDEVILLISTS VERTICILLATED VITILITIGATED WATERFLOODING
WELDABILITIES