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 Comparative data on long prison terms is thin, but there is consensus, if informal, that Smith has the American record. — Edmund H. Mahony, Hartford Courant, 19 July 2026 The poor air quality, which is dangerous for both players and fans, led FIFA and the White House to hold informal discussions over moving the World Cup final. — Kevin Baxter, Los Angeles Times, 18 July 2026 For the dozens of NHL, minor league and college players who make their off-season homes in Minnesota, informal morning skates at various arenas throughout the Twin Cities have been going on for decades. — Jess Myers, Twin Cities, 17 July 2026 That follows informal discussions between FIFA and World Cup task force CEO Andrew Giuliani over the matter. — Leon Imber, New York Times, 17 July 2026 See All Example Sentences for informal

Recent Examples of Synonyms for informal

Adjective

Halsey takes an unconventional approach to a button-up top at Guizo’s new flagship store in Los Angeles on July 23.

— People Staff, PEOPLE, 25 July 2026
Environmental regulations were already in place in 2008 when the unconventional Marcellus Shale gas boom began, but conventional drilling dates to the Drake well in 1859 – long before modern environmental oversight existed.

— Nathaniel Warner, The Conversation, 24 July 2026

Definition of unconventional

Adjective

Danielle and Kevin Jonas hold hands while on a casual date night in Mountain Lakes, New Jersey on July 21.

— People Staff, PEOPLE, 25 July 2026
For something more casual, Bungalow Beach Bar & Grill serves American favorites, fresh seafood, and an extensive rosé list just steps from the sand.

— Lauren Dana Ellman, Travel + Leisure, 25 July 2026

Definition of casual

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