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 Quiz → GRE Quiz → TOEFL Quiz → ← incomprehensible inconclusive → Study tips featuring "inconceivable" Let the Argument Reveal Unfamiliar Word Meanings Group Words Together by Emotional Tone Map Each Word Into a Connected Network 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