Treacherous

Adjective

 * 1) Exhibiting treachery.
 * 2) Deceitful; inclined to betray.
 * 3) Unreliable; dangerous.
 * a treacherous mountain trail

Related terms

 * treacher
 * treachery
 * trick
 * trickster
 * tricky

Adverbs for Treacherous
abominably; dangerously; alarmingly; ominously; portentously; slyly; smoothly; insidiously; hypocritically; flatteringly; furtively; cleverly;  disloyally;  despicably; boldly;  hideously;   subtly;   maliciously; grossly; deliberately; adroitly; vilely; astutely; inscrutably; undoubtedly; infinitely; deeply; darkly.

Thesaurus
Machiavellian, Punic, ambidextrous, artful, calculating, chancy, chiseling, collusive, covinous, crafty, crooked, cunning, dangerous, deceitful, deceptive, desultory, dishonest, disloyal, double, double-crossing, double-dealing, double-faced, double-minded, double-tongued, doublehearted, doubtful, dubious, duplicitous, faithless, false, false-principled, falsehearted, finagling, fraudulent, furtive, guileful, hairy, hazardous, indirect, infirm, insecure, insidious, insubstantial, jeopardous, misleading, perfidious, perilous, precarious, precariousness, provisional, recreant, risky, rocky, scheming, shaky, sharp, shifting, shifty, slippery, sneaky, surreptitious, temporary, tentative, ticklish, tottery, traitorous, trickish, tricky, two-faced, uncertain, undependable, underhand, underhanded, unfaithful, unfaithworthy, unhealthy, unloyal, unpredictable, unreliable, unsafe, unsolid, unsound, unstable, unsteadfast, unsteady, unsubstantial, unsure, untrue, untrustworthy, wicked, wily

Etymology
From treacher:

Translations

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