adj. 25B6; adjective UNFAILING, infallible, perfect, flawless, faultless, impeccable, unimpeachable; sure, true, assured, deadly; informal sure-fire.
UNERRING
Meaning of UNERRING in English
Concise Oxford thesaurus English vocabulary. Краткий оксфордский словарь английского языка тезаурус. 2012