Something that is stiff is firm or does not bend easily.
Clean the mussels with a stiff brush under cold running water. Something such as a door or drawer that is stiff does not move as easily as it should.
If you are stiff, your muscles or joints hurt when you move, because of illness or because of too much exercise.
Stiff behaviour is rather formal and not very friendly or relaxed.
She looked at him with a stiff smile.
Stiff can be used to mean difficult or severe.
The film faces stiff competition for the Best Film nomination.
A stiff drink is a large amount of a strong alcoholic drink.
A stiff whisky.
A stiff wind is blowing quite strongly.
If you are bored stiff, worried stiff, or scared stiff, you are extremely bored, worried, or scared.
Stiff upper lip.

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