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