13 letters

transpirative collaborative ∙ corroborative ∙ nondecorative unperforative deteriorative ∙ nonpejorative unexplorative commemorative ∙ unevaporative incorporative ∙ expectorative ∙ unrestorative Metanarrative seminarrative antinarrative ∙ impenetrative unpenetrative unarbitrative concentrative ∙ demonstrative ∙ remonstrative ∙ cirrostrative ∙ nonindurative prefigurative ∙ configurative ∙ nonfigurative ∙ disfigurative unsuppurative nonmaturative acculturative ∙ enculturative ∙ nonvegetative nonrecitative resuscitative ∙ nonexcitative premeditative ∙ nonmeditative regurgitative nonlimitative overimitative precipitative ∙ authoritative ∙ necessitative ∙ nonentitative ungravitative Argumentative ∙ frequentative ∙ nondenotative unconnotative unexhortative manifestative ∙ unconfutative uncommutative transmutative ∙ nonimputative individuative nonevaluative ∙ uninsinuative subderivative nonderivative ∙ uncaptivative photoreactive hyperreactive ∙ unradioactive electroactive ∙ unretroactive counteractive ∙ nonrefractive undiffractive unsubtractive nondetractive unprotractive unabstractive nonextractive metainfective antiinfective postinfective teleobjective semiobjective nonsubjective ∙ nonprojective nondeflective nonreflective noncollective preconnective nonconnective disconnective ∙ disrespective unprospective retrospective ∙ introspective ∙ extrospective noncorrective archdetective nonprotective uroprotective nonconvective contradictive ∙ unmaledictive nonpredictive unconflictive unrestrictive irrestrictive indistinctive ∙ undistinctive ∙ uninstinctive nonadjunctive unconjunctive ∙ antireductive cytoreductive autoinductive nonconductive ∙ nonproductive ∙ unobstructive ∙ undestructive uninstructive ∙ noninhibitive unprohibitive nonexhibitive interadditive transfugitive semiprimitive philogenitive primogenitive ∙ metacognitive nondefinitive nonaffinitive extrapunitive intropunitive nonexploitive ∙ unacquisitive uninquisitive ∙ nontransitive ∙ uviosensitive hyposensitive oversensitive ∙ juxtapositive hydropositive photopositive ∙ unsuppositive superpositive Interpositive transpositive ∙ nonrepetitive uncompetitive ∙ denumerantive unsubstantive discontentive overattentive ∙ nonpreventive circumventive ∙ nonappointive ponderomotive electromotive ∙ magnetomotive ∙ nonautomotive ∙ pseudocaptive contraceptive ∙ rheoreceptive adrenoceptive interoceptive ∙ exteroceptive ∙ neutroceptive preperceptive nonperceptive nonsusceptive indescriptive undescriptive omniscriptive transcriptive ∙ nonredemptive unpresumptive unconsumptive nonassumptive nonabsorptive ∙ chemisorptive chemosorptive precorruptive noncorruptive nondisruptive ∙ preconcertive overassertive ∙ nondistortive uncontrastive contragestive ∙ presuggestive nonsuggestive aerodigestive autodigestive postdigestive precongestive noncongestive nonexhaustive noncombustive unretributive unattributive inconsecutive ∙ unconsecutive unpersecutive semiexecutive interlocutive unrestitutive uninstitutive semireflexive antireflexive

14 letters

concavoconcave convexoconcave electroengrave interpervasive anticonvulsive ∙ postconvulsive Gegenoffensive superoffensive inapprehensive ∙ unapprehensive ∙ superexpensive ∙ antisubversive ∙ unintroversive hyperexcursive ultraexcessive autoregressive antiaggressive overaggressive ∙ nonprogressive ∙ antidepressive overdepressive postdepressive noncompressive nonsuppressive antiexpressive overexpressive overpermissive unintermissive retransmissive untransmissive interdiffusive ultrainclusive superinclusive ultraexclusive ∙ hyperobtrusive subapprobative disapprobative ∙ nondeprecative noneradicative antimedicative subpredicative nonpredicative felicificative unmodificative simplificative ∙ unverificative fructificative multiplicative ∙ nonimplicative nonapplicative nonduplicative nonexplicative subimbricative nonimbricative sophisticative nonprovocative nonelucidative photooxidative ∙ recommendative nonretardative Executordative nondelineative nonprocreative nonpropagative thigmonegative nonsegregative subaggregative disaggregative ∙ uncongregative supererogative ∙ undepreciative inappreciative ∙ unappreciative ∙ nonenunciative unrenunciative unannunciative subassociative nonassociative nonrepudiative reconciliative unconciliative uncalumniative unpropitiative substantiative ∙ immunoablative noncorrelative unannihilative unassimilative nonventilative defibrillative prelegislative nonlegislative prolegislative nonspeculative ∙ unarticulative noncalculative noninoculative unemasculative noncoagulative autoregulative nonstimulative unaccumulative unmanipulative congratulative ∙ recapitulative ∙ unamalgamative unconsummative preaffirmative disaffirmative unconfirmative noninformative misinformative transformative ∙ nonexplanative nondesignative noncombinative disciplinative noneliminative discriminative ∙ nongerminative nonterminative unilluminative predestinative ∙ conglutinative ∙ unanticipative unemancipative nondissipative nondeclarative unexhilarative nonpreparative unconsecrative undeliberative antiulcerative unexaggerative unaccelerative conglomerative ∙ nonenumerative undegenerative unregenerative unremunerative ∙ intraoperative noncooperative ∙ interoperative ∙ unrecuperative unvituperative unalliterative redintegrative ∙ disintegrative ∙ transmigrative ∙ nonelaborative overdecorative uninvigorative unameliorative nonexplorative nonevaporative noncorporative nonrestorative administrative ∙ unministrative unillustrative semifigurative presuppurative nonsuppurative uncompensative intercausative interpretative ∙ anticogitative unexcogitative nonqualitative rehabilitative ∙ undebilitative unexploitative unquantitative nongravitative nonfacultative unconsultative unaugmentative unalimentative unfermentative representative ∙ unpresentative unpreventative nonconnotative nonexhortative transportative noncommutative ∙ nonextenuative preinsinuative antiderivative ∙ aeroderivative unconservative adrenoreactive immunoreactive ∙ nonradioactive ∙ nonretroactive ∙ noninteractive ∙ nondiffractive nonsubtractive precontractive nondistractive supereffective ∙ interobjective antireflective ∙ overreflective unintellective unrecollective circumspective ∙ nonperspective retrodirective semiprotective renoprotective cytoprotective cryoprotective ∙ overprotective ∙ nonconflictive nonrestrictive ∙ unconstrictive subdistinctive nondistinctive ∙ noninstinctive interstinctive subconjunctive nonconjunctive subdisjunctive nondisjunctive photoinductive ∙ unreproductive irreproductive semiproductive antiproductive overproductive unintroductive nonobstructive nondestructive ∙ preinstructive noninstructive misinstructive deconstructive ∙ reconstructive ∙ unconstructive ∙ superstructive ∙ supersecretive uninterpretive nonprohibitive primoprimitive retrocognitive neurocognitive ∙ hypernutritive preacquisitive nonacquisitive ∙ suprasensitive ultrasensitive ∙ radiosensitive ∙ chemosensitive photosensitive ∙ supersensitive ∙ hypersensitive ∙ contrapositive ∙ thigmopositive nonsuppositive semiexpositive precompetitive ∙ noncompetitive ∙ reciprocantive consubstantive nonsubstantive prosubstantive superincentive chemoreceptive ∙ photoreceptive ∙ postconceptive proprioceptive ∙ cholinoceptive nociperceptive semiperceptive unapperceptive nondescriptive ∙ misdescriptive unproscriptive nonpresumptive nonconsumptive ∙ overassumptive uninterruptive noncontrastive autosuggestive ∙ unintromittive uncontributive redistributive ∙ nonattributive nonconsecutive ∙ nonpersecutive unsubstitutive

15 letters

subcontraoctave ∙ ultrapersuasive

Words with a ∙ are valid Scrabble words (SOWPODS word list)