treacherous

Definition of Treacherous in English :

1. treacherous, unreliable

dangerously unstable and unpredictable

Example Sentences:
'treacherous winding roads'
'an unreliable trestle'

2. perfidious, punic, treacherous

tending to betray; especially having a treacherous character as attributed to the Carthaginians by the Romans

Example Sentences:
'Punic faith'
'the perfidious Judas'
'the fiercest and most treacherous of foes'
'treacherous intrigues'

WordNet Lexical Database for English. Princeton University. 2010.

Treacherous

adjective

1.

betraying or likely to betray faith or confidence

2.

unstable, unreliable, or dangerous

treacherous weather

treacherous ground

adjective

1.

characterized by treachery; traitorous; disloyal; perfidious

2.

giving a false appearance of safety or reliability; untrustworthy or insecure

treacherous rocks

adj.

1. Guilty of or characterized by betrayal of confidence or trust; perfidious.

2. Characterized by unforeseen or hidden hazards; dangerous or deceptive: treacherous waters; treacherous footing.