that cannot be trusted; intending to harm you synonym deceitful不可信任的;背叛的;奸诈的 Oxford Collocations Dictionaryverbs- be
- prove
- become
- …
- extremely
- fairly
- very
- …
dangerous, especially when seeming safe 有潜在危险的 The ice on the roads made driving conditions treacherous. 路上的冰对驾车构成了隐患。 the mountain’s notoriously treacherous rocky crest 出名地暗藏危险的岩石山顶
Oxford Collocations Dictionaryverbs- be
- prove
- become
- …
- extremely
- fairly
- very
- …
Word OriginMiddle English (in sense 1): from Old French trecherous, from trecheor ‘a cheat’, from trechier ‘to cheat’.