adj. irresponsible, disreputable; untrustworthy, undependable, uncertain, unstable, treacherous, flimsy, weak He is unreliable and unlikely to be there when you need him The equipment was expensive, slow, and unreliable.
UNRELIABLE
Meaning of UNRELIABLE in English
Oxford thesaurus English vocab. Английский словарь Оксфорд тезаурус. 2012