GMAT Vocabulary Flash Cards @ englishpdf.com and englishteststore.com File 322 impertinence (n) Rudeness imperturbable (adj) Calm impervious (adj) Impenetrable impetuosity (n) Rashness impetuous (adj) Impulsive impetus (n) Any impulse or incentive impiety (n) Irreverence toward God impious (adj) Characterized by irreverence or irreligion