An average person, usually male, of no particular distinction, skill, or education, often a working stiff or lucky stiff.

“A Working Stiff's Manifesto: A Memoir of Thirty Jobs I Quit, Nine That Fired Me, and Three I Can't Remember was published in 2003.”

A person who is deceived, as a mark or pigeon in a swindle.

“She convinced the stiff to go to her hotel room, where her henchman was waiting to rob him.”

A cadaver; a dead person.

To fail to pay that which one owes (implicitly or explicitly) to another, especially by departing hastily.

“Realizing he had forgotten his wallet, he stiffed the taxi driver when the cab stopped for a red light.”

To cheat someone

To tip ungenerously

(of an object) Rigid; hard to bend; inflexible.

(of policies and rules and their application and enforcement) Inflexible; rigid.

(of a person) Formal in behavior; unrelaxed.