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impeccable above suspicion, blameless, exact, exquisite, faultless, flawless, immaculate, incorrupt, innocent, irreproachable, perfect, precise, pure, sinless, stainless, unblemished, unerring, unimpeachable Antonyms blameworthy, corrupt, cursory, defective, deficient, faulty, flawed, shallow, sinful, superficial.
WordReference Random House Unabridged Dictionary of American English Â© 2016. imâ¢perâ¢viâ¢ous (im pÃ»râ²vÄ És), adj. 1  not permitting penetration or passage; impenetrable:The coat is impervious to rain.  incapable of being injured or impaired:impervious to wear and tear.