2
superb(adjective, good, great, sound, excellent)
2
superlative(adjective, excellent, delicate, pure, superb)
2
ultimate(adjective, perfect, superb, expert, skilled)
2
unadulterated(flawless, faultless, textbook, unspoiled, uncontaminated)
2
uncorrupted
2
undamaged(adjective, sound, perfect, flawless, faultless)
2
unexceptionable(adjective, bright, clean, perfect, acceptable)
2
unimpaired(adjective, sound, perfect, flawless, faultless)
2
unmixed(flawless, faultless, textbook)
2
unspotted(good, clear, correct, clean, perfect)
2
upright(adjective, good, clear, clean, honest)
2
whole(adjective, sound, correct, clean, perfect)
1
above suspicion(expression, adjective, good, clear, honest)
1
acceptable(adjective, sound, flawless, faultless, inoffensive)
1
according to Hoyle(expression, idiom, right, perfect, exact)
1
aces(adjective, perfect, pure, splendid, flawless)
1
acme(adjective, perfect)
1
actual(right, perfect, exact, proper, true)
1
adept(adjective, pure, splendid, flawless, faultless)
1
agreeable(adjective, sound, smooth, polite, acceptable)
10 years ago|17k views|share |citing 
APASmart Define. (2016). impeccable thesaurus. Retrieved September 22, 2026, from https://smartdefine.org/impeccable/thesaurus/synonyms
ChicagoSmart Define. 2016. "impeccable thesaurus" https://smartdefine.org/impeccable/thesaurus/synonyms (accessed September 22, 2026).
HarvardSmart Define 2016, impeccable thesaurus, Smart Define, viewed 22 September, 2026, <https://smartdefine.org/impeccable/thesaurus/synonyms>.
MLASmart Define. "impeccable thesaurus" 31 March 2016. Web. 22 September 2026. <https://smartdefine.org/impeccable/thesaurus/synonyms>