Marked by keen caution, cunning, and watchfullness especially in detecting and escaping danger

EX: Investors are increasingly wary about putting money into stocks. 

Simultaneous and contradictory attitudes or feelings (as attraction and repulsion) toward an object, person, or action.

EX: She was ambivalent about her daily hairstyle. 

To use equivocal language especially when intent to decieve, to avoid committing oneself in what one says. 

EX: The applicant seemed to be equivocating when we asked him about his last job. 

Clever, crafty

EX: A wily judge of character, she takes advantage of car buyers' insecurities to sell them a bigger machine than they really needed. 

Acting or doing something clandestinely (in secret)

EX: A private investigator is adept at taking surreptitious pictures of adulterous couples. 

A trick, deception in order to conceal or evade.

EX: His act was just a clever ruse to get me to go out with him. 

Impulsive, unpredictable.  

EX: The employees were at the mercy of a capricious boss. 

Irrelevant

EX: It was an inconsequential error that did not impact the outcome. 

Having no interest or concern, showing no emotion.

EX: Most Americans are apathetic about this important concern.

Capable of being understood in multiple ways. 

EX: He looked at her with an ambiguous smile.