treacherousKK [ˈtrɛtʃɚəs] ｜ /ˈtrɛtʃɚəs/
GEPT 中高級
C2adjective
likely to betray someone’s trust
After years of friendship, Mark turned treacherous and revealed all of Sarah's secrets to their coworkers.
背信棄義的；出賣人的
C2adjective
not to be relied on; dangerously unstable and unpredictable
The treacherous road conditions made driving extremely hazardous.
危險的；難以預料的