e.g. I was unable to twist the stiff wire. The rod was incredibly stiff and would not budge.
e.g. I thought he was rather stiff and rude when talking to us.
e.g. There is a stiff penalty for not following the rules. The stiff wind blowing suggested that a storm was coming.
e.g. He is such a stiff that he isn't very interesting to talk to.
e.g. I didn't want to stiff the workers by not paying for their service.