Crafty (adjective)

1. Clever and skillful, often in a sly or cunning way.
2. Showing inventiveness and skill in devising a plan or strategy.

Origin:

Middle english, from old english cræftig; akin to old high german kraft power.

Examples:

1. He was a crafty negotiator, always able to get the best deal.
2. She was crafty enough to outsmart her opponents.
3. His crafty plan allowed him to take advantage of the situation.
4. The thief was crafty enough to evade the police for months.
5. The politician was known for his crafty tactics to win the election.