adj. 25B6; adjective IMPERCEPTIBLE, minute, tiny, slight, small; insignificant, inconsequential, unimportant, negligible, trivial, minor; informal piddling, piffling; formal exiguous.
considerable.
INAPPRECIABLE
Meaning of INAPPRECIABLE in English
Concise Oxford thesaurus English vocabulary. Краткий оксфордский словарь английского языка тезаурус. 2012