treacherous (adj.)

• ambidextrous
• artful
• calculating
• chancy
• collusive
• crafty
• crooked
• cunning
• dangerous
• deceitful
• deceptive
• desultory
• dishonest
• disloyal
• double
• double-dealing
• double-faced
• double-tongued
• doubtful
• dubious
• duplicitous
• faithless
• false
• fraudulent
• furtive
• guileful
• hairy
• hazardous
• indirect
• infirm
• insecure
• insidious
• insubstantial
• misleading
• perfidious
• perilous
• precarious
• provisional
• recreant
• risky
• rocky
• scheming
• shaky
• sharp
• shifting
• shifty
• slippery
• sneaky
• surreptitious
• temporary
• tentative
• ticklish
• tottery
• traitorous
• tricky
• two-faced
• uncertain
• undependable
• underhand
• underhanded
• unfaithful
• unhealthy
• unpredictable
• unreliable
• unsafe
• unsound
• unstable
• unsteady
• unsubstantial
• unsure
• untrue
• untrustworthy
• wicked
• wily