conclusive

1 serving to put an end to all debate or questioning the archeological discovery was conclusive proof that the Vikings had indeed settled in North America around 1000 a.d. Synonyms absolute, clear, deciding, decisive, definitive, last Related Words determinate, determinative, dispositive, hands-down, inarguable, incontestable, incontrovertible, indisputable, indubitable, irrefutable, unanswerable, undebatable, undeniable, undisputable, unquestionable; unchallenged, uncontested, undisputed; unambiguous, unequivocal; certain, definite, positive, sure; cogent, compelling, convincing, persuasive, telling Near Antonyms debatable, disputable, doubtable, doubtful, moot, problematic (also problematical), questionable, refutable; ambiguous, equivocal; controversial, debated, disputed Antonyms inconclusive, indecisive, unclear

2 having the power to persuade a conclusive argument for allowing the students to put on a play of their own choosing Synonyms compelling, cogent, convincing, decisive, effective, forceful, persuasive, satisfying, strong, tellingRelated Words authoritative, definitive; sound, valid, well-founded; important, significant, weighty; material, pertinent, relevantNear Antonyms groundless, invalid, shaky, unfounded, unsound; inconsequential, insignificant, unimportant; immaterial, irrelevant; feeble, weakAntonyms inconclusive, indecisive, ineffective, uncompelling, unconvincing, unpersuasive