Shiftier

adjective

1. Subject to frequent changes in direction.
2. (of a person's eyes) Moving from one object to another, not looking directly and steadily at the person with whom one is speaking.
3. Having the appearance of being dishonest, criminal or unreliable.

   "He was a shifty character in a seedy bar, and I checked my wallet was still there after talking to him."

4. Resourceful; full of, or ready with, shifts or expedients.