SAT GRE TOEFL imperceptible Definition Too slight or gradual to be seen or noticed. Example "There was an imperceptible shift in the wind direction." Sign in to save SAT Quiz → GRE Quiz → TOEFL Quiz → ← imperative imperial → Study tips featuring "imperceptible" Spot the Vocabulary Trap in Every Question Write GRE Words Into Your Own Sentences TOEFL Academic Vocabulary: Study by Topic Related words SAT abase SAT abdicate SAT abdomen SAT abduction SAT abet SAT abeyance SAT abject SAT abjure SAT ablution SAT abnegate SAT abnormal SAT abominable