INFORMAL Synonyms: 85 Similar and Opposite Words

informal

adjective

(ˌ)in-ˈfȯr-məl

Definition of informal

as in unconventional

not rigidly following established form, custom, or rules an informal meeting allowed everyone to get acquainted

Synonyms & Similar Words

Relevance

Antonyms & Near Antonyms

as in casual

not designed to be worn only on special occasions chose an informal flowery dress

Synonyms & Similar Words

Antonyms & Near Antonyms

as in colloquial

used in or suitable for speech and not formal writing the use of informal language in a scholarly article is really inappropriate

Synonyms & Similar Words

Antonyms & Near Antonyms

Example Sentences

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Recent Examples of informal Wednesday began badly, with news of an Iranian attack on American targets in the Middle East, ending an informal pause in fighting. — Rob Crilly, The Washington Examiner, 31 July 2026 Meanwhile, the poorest bear the brunt, with informal workers’ earnings falling about 40 percent during heatwaves. — Jasmin Malik Chua, Footwear News, 31 July 2026 His informal getup, a T-shirt and shorts, contrasts with the elegant environment primed for business lunches and ostentatious dinners. — Carlos Aguilar, Los Angeles Times, 31 July 2026 Many transgender Indians rely on community organizations and informal support networks when facing family rejection. — Aakash Hassan, Christian Science Monitor, 31 July 2026 See All Example Sentences for informal

Recent Examples of Synonyms for informal

Adjective

The result is one of the most unconventional short courses in the game.

— Erik Matuszewski, Forbes.com, 31 July 2026
Once considered unprofessional or unconventional in some settings, tattoos have become far more accepted across generations.

— Rachel Brown Kirkland, AJC.com, 30 July 2026

Definition of unconventional

Adjective

Screenplay credits are shared by Damodaran, Joses Imona, and Jennifer Litau, with Litau also handling Tok Pisin and vernacular-language translation duties.

— Naman Ramachandran, Variety, 17 July 2026
Compiled in 1964 by Elektra Records founder Jac Holzman, this four-LP, 83-track box set was intended as an accessible survey of the roots and branches of American vernacular music.

— Ted Olson, The Conversation, 2 July 2026