adj.不可靠的，背叛的；adj.危险的,
Merriam-Webster Online Dictionary
treacherous (adjective)1.
characterized by or manifesting - treachery perfidious
2.
a) likely to betray trust - unreliable a treacherous memory
b) providing insecure footing or support - treacherous quicksand
c) marked by hidden dangers, hazards, or perils faithless
Merriam-Webster Online Thesaurus
treacherous (adjective)not true in one's allegiance to someone or something
SYNONYMS:
disloyal, false, fickle, inconstant, perfidious, recreant, traitorous, treacherous, unfaithful, untrueRELATED WORDS:
irresponsible, trustless, undependable, unreliable, untrustworthy; faltering, hesitant, vacillating, wavering; dubious, irresolute, uncertain; apathetic, dispassionate, uninterestedNEAR ANTONYMS:
dependable, dutiful, reliable, responsible, solid, tried, tried-and-true, trustable, trustworthy, trusty; unfaltering, unhesitating, unwavering; determined, intent, resolute; confirmed, dyed-in-the-wool, inveterate, sworn; ardent, avid, enthusiastic, fervent, fervid, impassioned, passionate