Meaning of “stiff” - Learner’s Dictionary

stiff

adjective uk us /stɪf/
HARD

B2 hard and difficult to bend:

stiff material
NOT MOVING

B2 A door, drawer, etc that is stiff does not move as easily as it should.

HURTING

If a part of your body is stiff, it hurts and is difficult to move:

I've got a stiff neck.
SEVERE

very severe or difficult:

We need stiffer penalties for drink driving.
FORMAL

behaving in a way that is formal and not relaxed

THICK

A stiff substance is thick and does not move around easily:

Whip the cream until it is stiff.
stiff drink/whisky/vodka, etc

a strong alcoholic drink:

I need a stiff brandy.
stiff wind/breeze

a wind that is quite strong

stiffly adverb
stiffness noun [ U ]

(Definition of “stiff adjective” from the Cambridge Learner’s Dictionary © Cambridge University Press)