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- - stick to one's guns
  - stick up
  - stick up for
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  - stickiness
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  - sticky
  - stiff
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  - stiffen
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stiffen

UK:^*^*UK and possibly other pronunciationsUK and possibly other pronunciations/ˈstɪfənəʳ/US:USA pronunciation: respellingUSA pronunciation: respelling(stif′ə nər, stif′nər)

stiffen
WordReference English Thesaurus © 2026

Sense: To grow stiff

Synonyms:

thicken, harden Collocations, ache Collocations, whip Collocations, become rigid, firm Collocations

Antonyms:

relax Collocations, limber, loosen up, ease up, become loose, soften

Sense: To cause to become stiff

Synonyms:

harden Collocations, starch Collocations, brace Collocations, prop Collocations, strengthen Collocations, increase Collocations, prop up, make more severe, galvanise

Antonyms:

soften, weaken Collocations, dilute, slacken

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⇱ stiffener - WordReference.com English Thesaurus

stiffen