| Impeccable 1. (a.) Blameless; flawless; not liable to sin; exempt from the possibility of doing wrong. 2. (n.) One who is impeccable; esp., one of a sect of Gnostic heretics who asserted their sinlessness. Thesaurus Entries absolute, accurate, beyond all praise, blameless, chaste, clean, correct, defectless, destitute, errorless, exact, exquisite, faultless, flawless, ideal, immaculate, impecunious, impoverished, indefectible, indefective, indigent, infallible, irreproachable, just right, necessitous, needy, nice, peerless, penurious, perfect, poverty-stricken, precise, proper, pure, right, sinless, spotless, stainless, taintless, unadulterated, unblemished, uncontaminated, undefiled, unerring, unfaultable, unflawed, unimpeachable, unmixed, unprosperous, unsoiled, unspotted, unsullied, untainted, white | ![]() |