SAT GRE TOEFL inconceivable Definition Impossible to imagine or believe. Example "The idea that humans could live on Mars is still inconceivable to many." Sign in to save SAT PDF — $25 GRE PDF — $25 TOEFL PDF — $25 ← incomprehensible inconclusive → Study tips featuring "inconceivable" TOEFL Academic Vocabulary: Study by Topic How Context Clues Save You on the SAT Related words SAT antonym SAT abase SAT abdicate SAT abdomen SAT abduction SAT abet SAT abeyance SAT abject SAT abjure SAT ablution SAT abnegate SAT abnormal