There are 441 fourteen-letter words containing A, D, T and U, https://www.bestwordlist.com/c/a/4/14letterwordswithadtu.htm ACCUSTOMEDNESS ADEQUATENESSES ADIATHERMANOUS ADMEASUREMENTS ADMINICULATING ADSCITITIOUSLY ADVANTAGEOUSLY ADVENTITIOUSLY AGRIFOODSTUFFS AGROINDUSTRIAL AGROINDUSTRIES ALTITUDINARIAN AMBIDEXTROUSLY ANISODACTYLOUS ANTEDILUVIALLY ANTIQUATEDNESS APPROPINQUATED ARTIODACTYLOUS ATTITUDINARIAN ATTITUDINISERS ATTITUDINISING ATTITUDINIZERS ATTITUDINIZING AUDIOCASSETTES AUDIOMETRICIAN AUDITABILITIES AUTOANTIBODIES AUTODESTRUCTED AUTOPOLYPLOIDS AUTOPOLYPLOIDY AUTORADIOGRAMS AUTORADIOGRAPH AUTOSCHEDIASMS AUTOSCHEDIAZED AUTOSCHEDIAZES AUTOTETRAPLOID BIOACCUMULATED BUREAUCRATISED BUREAUCRATIZED BUTYRALDEHYDES CALCULATEDNESS CHATEAUBRIANDS CIRCUMVALLATED CLAIRAUDIENTLY COADJUTORSHIPS COASTGUARDSMAN COASTGUARDSMEN CONCEPTUALISED CONCEPTUALIZED CONDUPLICATION CONNATURALISED CONNATURALIZED CONQUISTADORES CONSUETUDINARY CONTEXTUALISED CONTEXTUALIZED CONTRADICTIOUS COTRANSDUCTION COUNTERCHANGED COUNTERCHARGED COUNTERCHARMED COUNTERCLAIMED COUNTERDEMANDS COUNTERDRAWING COUNTERMANDING COUNTERMARCHED COUNTERPLANNED COUNTERPLEADED COUNTERRAIDING COUNTERRALLIED COUNTERSHADING COUNTERSTAINED COUNTERTRADING CUSTODIANSHIPS DAGUERREOTYPED DAGUERREOTYPER DAGUERREOTYPES DAUGHTERBOARDS DAUGHTERLINESS DEAMBULATORIES DEARTICULATING DECAMETHONIUMS DECAPSULATIONS DECARBURATIONS DEDUPLICATIONS DEFLOCCULATING DEFLOCCULATION DEGLUTINATIONS DEGRANULATIONS DEHUMANISATION DEHUMANIZATION DENATURALISING DENATURALIZING DENTICULATIONS DENUMERABILITY DESPIRITUALISE DESPIRITUALIZE DESQUAMATORIES DESULFURATIONS DESULPHURATING DESULPHURATION DEUTERAGONISTS DEUTEROGAMISTS DIAMANTIFEROUS DINOTURBATIONS DIPTEROCARPOUS DISACCUSTOMING DISADVENTUROUS DISAMBIGUATING DISAMBIGUATION DISARTICULATED DISARTICULATES DISARTICULATOR DISATTRIBUTION DISAUTHORISING DISAUTHORIZING DISCOLOURATION DISCOMBOBULATE DISCONTINUANCE DISCOUNTENANCE DISCOURAGEMENT DISEQUILIBRATE DISFEATUREMENT DISFIGURATIONS DISILLUMINATED DISILLUMINATES DISNATURALISED DISNATURALISES DISNATURALIZED DISNATURALIZES DISPUTABLENESS DISPUTATIOUSLY DISQUANTITYING DISQUISITIONAL DISREPUTATIONS DISSIMULATIONS DISTEMPERATURE DISTRIBUTARIES DISTRIBUTIONAL DIURETICALNESS DIVERTICULATED DOCUMENTALISTS DOCUMENTARIANS DOCUMENTARISED DOCUMENTARISES DOCUMENTARISTS DOCUMENTARIZED DOCUMENTARIZES DOCUMENTATIONS DOWNREGULATION DRAUGHTINESSES DRAUGHTPROOFED DRAUGHTSPERSON DULCIFICATIONS EDUCATEDNESSES EDUCATIONALIST EMPYREUMATISED EMPYREUMATIZED ENDEAVOURMENTS ENDURABILITIES EQUIPONDERATED EQUIPONDERATES EUDEMONISTICAL EXCOMMUNICATED FASTIDIOUSNESS FEUDALISATIONS FEUDALIZATIONS FLANNELMOUTHED FOUNDATIONALLY FOUNDATIONLESS FRAUDULENTNESS FUNDAMENTALISM FUNDAMENTALIST FUNDAMENTALITY GASTRODUODENAL GLUTARALDEHYDE GRANDDAUGHTERS HAEMODILUTIONS HEADQUARTERING HUMIDIFICATION HYDROACOUSTICS HYDROPNEUMATIC HYDROSULPHATES IDOLATROUSNESS INADEQUATENESS INAUDIBILITIES INDIVIDUALISTS INDIVIDUATIONS INDUBITABILITY INDUPLICATIONS INDUSTRIALISED INDUSTRIALISES INDUSTRIALISMS INDUSTRIALISTS INDUSTRIALIZED INDUSTRIALIZES INSUBORDINATES INTERJACULATED INTEROSCULATED INTRAMEDULLARY INVOLUCELLATED JURISDICTIONAL LATITUDINARIAN LECYTHIDACEOUS LEPTODACTYLOUS LIQUIDATIONISM LIQUIDATIONIST LONGITUDINALLY MACRODACTYLOUS MALADJUSTMENTS MISADJUSTMENTS MISADVENTURERS MISADVENTUROUS MISARTICULATED MISUNDERSTANDS MODULABILITIES MONUMENTALISED MONUMENTALIZED MOULDABILITIES MOUNTAINBOARDS MULTIBARRELLED MULTICANDIDATE MULTICHAMBERED MULTICUSPIDATE MULTIDIALECTAL MULTINUCLEATED MULTITHREADING MUNDIFICATIONS MUNDIFICATIVES NANOSTRUCTURED NONDOCUMENTARY NONEDUCATIONAL NONINDUSTRIALS NONJUDGEMENTAL NUDIBRANCHIATE OBDURATENESSES OSTEODERMATOUS OUTDATEDNESSES OUTLANDISHNESS OUTMANIPULATED OUTRECUIDANCES OVERABUNDANTLY OVERADJUSTMENT OVEREDUCATIONS OVERFASTIDIOUS OVERSPECULATED OVERSTIMULATED OXIDOREDUCTASE PACHYDACTYLOUS PACHYDERMATOUS PANDICULATIONS PARTICULARISED PARTICULARIZED PEDUNCULATIONS PENTADACTYLOUS PERSUADABILITY PHOTODUPLICATE PLATINIRIDIUMS PLATITUDINISED PLATITUDINISER PLATITUDINISES PLATITUDINIZED PLATITUDINIZER PLATITUDINIZES PODOPHTHALMOUS POLYBUTADIENES POSTGRADUATION POSTINDUSTRIAL PREDEVALUATION PREJUDICATIONS PROPAEDEUTICAL PRUDENTIALISMS PRUDENTIALISTS PSEUDAESTHESIA PSEUDARTHROSES PSEUDARTHROSIS PSEUDOPREGNANT PUNDITOCRACIES QUADRIGEMINATE QUADRILATERALS QUADRILITERALS QUADRILLIONTHS QUADRISECTIONS QUADRUMVIRATES QUADRUPLICATED QUADRUPLICATES QUARTERDECKERS QUARTODECIMANS QUINTUPLICATED QUODLIBETARIAN RADIOAUTOGRAPH RADIOSTRONTIUM REDISCOUNTABLE REDUPLICATIONS REMANUFACTURED REPUDIATIONIST RHEUMATOIDALLY ROUNDABOUTEDLY ROUNDABOUTNESS RUGGEDISATIONS RUGGEDIZATIONS SANSCULOTTIDES SCRATCHBUILDER SESQUIPEDALITY SLANTENDICULAR SLANTINDICULAR SOLIDUNGULATES SOLITUDINARIAN SOUTHEASTWARDS SOUTHWESTWARDS STOUTHEARTEDLY STRUCTURALISED STRUCTURALIZED SUBADOLESCENTS SUBCATEGORISED SUBCATEGORIZED SUBDEPARTMENTS SUBINDICATIONS SUBINFEUDATING SUBINFEUDATION SUBINFEUDATORY SUBORDINATIONS SUBSIDIARITIES SUBSIDISATIONS SUBSIDIZATIONS SUBSTANTIVISED SUBSTANTIVIZED SULFACETAMIDES SULPHACETAMIDE SUPERADDITIONS SUPERDAINTIEST SUPERDELEGATES SUPERDIPLOMATS SUPERDOMINANTS SUPERINSULATED SUPERORDINATED SUPERORDINATES SUPERSATURATED SUSPERCOLLATED TETRADACTYLOUS TETRAFLUORIDES THOROUGHBRACED THUNDERFLASHES TRADUCIANISTIC TRANSDUCTIONAL TREPIDATIOUSLY TYRANNOSAURIDS ULTRACIVILISED ULTRACIVILIZED ULTRACREPIDATE ULTRAHAZARDOUS ULTRAMODERNISM ULTRAMODERNIST ULTRAWIDEBANDS UNACCLIMATISED UNACCLIMATIZED UNACCOMMODATED UNACCULTURATED UNACCUSTOMEDLY UNADAPTABILITY UNAFFECTEDNESS UNANESTHETISED UNANESTHETIZED UNAPPROPRIATED UNAVOIDABILITY UNCERTIFICATED UNCOMMUNICATED UNCONFEDERATED UNCONSOLIDATED UNCONTAMINATED UNCONTEMPLATED UNCONTRADICTED UNCORROBORATED UNCREDENTIALED UNCRYSTALLISED UNCRYSTALLIZED UNDECIDABILITY UNDEMONSTRABLE UNDEMONSTRATED UNDERESTIMATED UNDERESTIMATES UNDERGRADUATES UNDERGRADUETTE UNDERINFLATION UNDERPAINTINGS UNDERPOPULATED UNDERREACTIONS UNDERSATURATED UNDERSECRETARY UNDERSTAFFINGS UNDERSTANDABLE UNDERSTANDABLY UNDERSTANDINGS UNDERSTATEMENT UNDERSTRAPPERS UNDERSTRAPPING UNDERTENANCIES UNDERVALUATION UNDESIRABILITY UNDETERMINABLE UNDETERMINABLY UNDIDACTICALLY UNDISTRACTEDLY UNDOCTRINAIRES UNDOGMATICALLY UNDOMESTICATED UNDOMESTICATES UNDRAMATICALLY UNDULATIONISTS UNFRACTIONATED UNIDENTIFIABLE UNIDENTIFIABLY UNIDIRECTIONAL UNINCORPORATED UNINTIMIDATING UNMANUFACTURED UNMATERIALISED UNMATERIALIZED UNMATRICULATED UNPEDANTICALLY UNPREDICTABLES UNPREMEDITABLE UNPREMEDITATED UNRECIPROCATED UNREFRIGERATED UNRESTRAINEDLY UNROMANTICISED UNROMANTICIZED UNSTANDARDISED UNSTANDARDIZED UNSTEADINESSES UNSYSTEMATISED UNSYSTEMATIZED UNTHRIFTIHEADS UNTHRIFTYHEADS UNTOWARDLINESS UNTOWARDNESSES UPGRADEABILITY UPSTANDINGNESS VALETUDINARIAN VALETUDINARIES