"stiff" can be used as part of a sentence and is a correct and usable term in written English.
It can be used as an adjective to describe something that is firm, rigid, or difficult to bend. Example: The old man's fingers were stiff from arthritis, making it difficult for him to hold the pen. In this sentence, "stiff" is describing the condition of the old man's fingers, conveying that they are rigid and not easy to move.
Exact(54)
Stiff, indeed.
Stiff back.
Stiff upper lip.
Too stiff, too professorial.
"Stiff knot here.
"I'm stiff," he said.
A stiff gentility reigns.
Similar(4)
Stiff-necked like me.
Do stiff-legged deadlifts.
Try stiff-legged deadlifts.
He's stiff".
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com