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Definitions

stiffen

[stif-uhn] / ˈstɪf ən /
VERB
make or become harder
Synonyms
STRONGEST
reinforce solidify stabilize strengthen
STRONG
anneal benumb brace cake candy cement chill clot coagulate condense congeal crystallize curdle firm fix freeze gel harden inflate inspissate jell jelly ossify petrify precipitate prop set starch steady tauten tense thicken
Antonyms
STRONGEST
weaken
STRONG
dilute dissolve heat liquefy melt separate soften thin unfix
WEAK
loosen

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

She has also vowed to stiffen prison sentences and to impose a state of emergency in areas worst hit by crime.

From Barron's • Feb. 1, 2026

This involves the buildup of dense, fibrous tissue around the tumor, made up of cells and proteins that stiffen and inflame the area.

From Science Daily • Jan. 30, 2026

The effort to scrap the provision to stiffen penalties drew sweeping criticism from the governor and on social media.

From Los Angeles Times • May 1, 2025

Nonetheless, this is an important move that can help stiffen the spines at other schools.

From Salon • Apr. 16, 2025

I stiffen, wondering if you-know-who is somewhere nearby.

From "Legendary Frybread Drive-In" by Cynthia Leitich Smith

Vocabulary lists containing stiffen

Mid-Air

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