unable to be affected by; not allowing fluid to pass through
GMAT
GRE
SAT
Formal
See impervious in a sentence written about what you actually care about
Brevlex writes every example sentence around your interests, then schedules it with spaced repetition so it sticks. No generic textbook line — a sentence for you.
5000 GRE Words (recognized prep compilation)Recognized
SparkNotes 1000 SAT WordsRecognized
Each source is a real, checkable word list that contains impervious. We never claim an official exam-board list — none is published for the GRE, GMAT, or SAT.