adjective
Definition: Not easy to bend or move; firm and rigid.
Example: The chair was too stiff to sit comfortably for a long time.
adverb
Definition: In a way that is rigid or not flexible; to a complete extent or totally.
Example: He stood stiff, unable to move after the cold wind hit him.
noun
Definition: A slang term used to refer to a corpse or a person who is overly formal or stiff in behavior.
Example: The detective examined the stiff found in the abandoned building.
transitive verb
Definition: To not give someone what they expected or promised, especially in terms of money or a tip.
Example: He stiffed the waiter by not leaving a tip after the meal.