SAT GRE TOEFL immutable Definition Unchanging over time or unable to be changed. Example "The laws of physics are considered immutable by scientists." Sign in to save SAT Quiz → GRE Quiz → TOEFL Quiz → ← immunity imp → Study tips featuring "immutable" 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