adjective
Synonyms: imperceptible , impalpable, imponderable, inappreciable, indiscernible, insensible, intangible, unapparent, unappreciable, unobservable
adjective
Synonyms: imperceptible , impalpable, imponderable, inappreciable, indiscernible, insensible, intangible, unapparent, unappreciable, unobservable
Merriam Webster. Collegiate thesaurus English vocabulary. Английский энциклопедический словарь тезаурус. 2003