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treach·er·ous

treacherous

 
 
pronunciation:
tre ch rs
part of speech: adjective
definition 1: betraying or likely to betray trust; false.
The king's treacherous brother betrayed him to his enemy.Her treacherous friend told her secrets to others.
antonyms:
faithful, loyal
definition 2: full of danger or risk.
They were warned not to ski the treacherous slope.
similar words:
dangerous, risky
derivations: treacherously (adv.), treacherousness (n.)