frightening

adjective

fright·​en·​ing ˈfrī-tᵊn-iŋ 

ˈfrīt-niŋ

: causing fear

frightening news

a very frightening experience

The man with red eyes made the frightening grimace that passed for his smile.

—Madeleine L'Engle

For a man who had tussled with crocs, venomous snakes and other frightening creatures, this was going to be a leisurely swim.

—Jennifer Wulff et al.

Synonyms of frightening

• terrifying
• scary
• formidable
• horrible
• terrible
• intimidating

Examples of frightening in a Sentence

a truly frightening movie

Recent Examples on the Web

What had felt merely odd instantly became frightening. — Ashley Vega, PEOPLE, 24 June 2026

This is a recurring problem with frightening applications. — Aj Willingham, AJC.com, 24 June 2026

Earlier movie versions have managed the story’s most frightening moments with the limited technology available at the time—much plastic and spongy stuff; monsters in process shots looming over little men; papier-mâché boulders flung from hilltops. — David Denby, New Yorker, 21 June 2026

Even more frightening, the percentage exceeded 50% in many groups, including insects, terrestrial vertebrates, and marine species. — Maria Mocerino, Interesting Engineering, 21 June 2026

Word History

Etymology

from present participle of frighten

First Known Use

1652, in the meaning defined above

Rhymes for frightening

• brightening
• heightening
• lightening
• tightening
• whitening
• enlightening