Shifty (adjective)

1. Acting in a dishonest or deceitful way.
2. Unreliable, untrustworthy or evasive.

Origin:

The word "shifty" is likely from the old english word "sceift" which means "changeable" or "unreliable".

Examples:

1. The salesman had a shifty look in his eye and I didn't trust him.
2. He was known to be shifty and always looking for a way to cheat or deceive people.
3. She had a shifty demeanor and it made everyone feel uneasy around her.
4. His shifty attitude made it hard for the police to trust him as a witness.
5. The politician had a shifty reputation and it made it hard for people to trust him.