GMAT Vocabulary Flash Cards @ englishpdf.com and englishteststore.com File 319 impair (v) To cause to become less or worse impale (v) pierce through with, or stick on; something pointed impalpable (adj) Imperceptible to the touch impartial (adj) Unbiased impassable (adj) That can not be passed through or over impasse (n) a situation that has no solution or escape impassible (adj) Not moved or affected by feeling impassive (adj) Unmoved by or not exhibiting feeling