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Pronunciation varies by accent · adjective
superlative form of stiff: most stiff Most rigid, most inflexible, most unbending..
Use stiffest when its meaning, tone and grammar fit the full sentence. A synonym is not always a direct replacement.
Stiffest means superlative form of stiff: most stiff Most rigid, most inflexible, most unbending..
The closest synonym depends on the sentence and intended sense.
The opposite depends on the specific sense.
Use stiffest where its definition matches the intended context.
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