STIFFEN Synonyms: 9 Similar and Opposite Words

stiffen

verb

ˈsti-fən

as in to strengthen

to make more harsh, uncompromising, or severe plans to further stiffen the already onerous requirements for admission to the elite military unit

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Example Sentences

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Recent Examples of stiffen Volkswagen’s premium Audi brand has lost much of its luster in recent years, dragged down by trade tariffs, stiffening competition and a patchy electric-vehicle roster. —

William Wilkes, Bloomberg, 8 June 2026 Chronic inflammation damages blood vessels, stiffening them and increasing resistance. —

Jennifer Berger, Verywell Health, 1 June 2026 One was to basically put on the record and call out everything that this FCC has done to try to bring Disney to heel but also to encourage it and other broadcasters to stiffen their spine. —

ABC News, 26 May 2026 His eyes locked to the right, his tiny body stiffened and his face turned red. —

Jordan Greene, PEOPLE, 19 May 2026 See All Example Sentences for stiffen

Recent Examples of Synonyms for stiffen

strengthen

Verb

The fragrance-free formula moisturizes with ceramides to help restore and strengthen the skin barrier, while the brand's signature thermal spring water soothes and rebalances stressed-out skin.

— Christa Joanna Lee, Allure, 19 June 2026
Sign up for a short learning series that sharpens skills, then share one takeaway with someone close to strengthen connection.

— Tarot.com, Sun Sentinel, 19 June 2026