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

adjective. Characterized by unforeseen or hidden hazards; dangerous or deceptive.

Using treachery; violating allegiance or faith pledged; traitorous to the state or sovereign; perfidious in private life; betraying a trust.

Marked by deceitfulness or perfidy; characteristic of a traitor.

Having a good, fair, or sound appearance, but worthless or bad in character or quality; deceptive; not to be depended on or trusted.

Synonyms Faithless, etc. (see perfidious), recreant, treasonable.

adjective. Like a traitor; involving treachery; violating allegiance or faith pledged; traitorous to the state or sovereign; perfidious in private life; betraying a trust; faithless.

adjective. Exhibiting treachery.

adjective. Deceitful; inclined to betray.

adjective. Unreliable; dangerous.

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

adjective. dangerously unstable and unpredictable