The meaning of INFORMAL is marked by the absence of formality or ceremony. How to use informal in a sentence.

INFORMAL definition: 1. not formal or official: 2. (of clothing, behaviour, speech) suitable when you are with friends…. Learn more.

Informal definition: without formality or ceremony; casual.. See examples of INFORMAL used in a sentence.

1. without formality or ceremony; casual: an informal visit. 2. not according to the prescribed, official, or customary way or manner; irregular; unofficial: informal proceedings. 3. suitable to …

Definition of informal adjective from the Oxford Advanced Learner's Dictionary. relaxed and friendly; not following strict rules of how to behave or do something. Discussions are held on …

If something’s informal, it’s casual and relaxed and doesn’t follow any particular rules or conventions, whether that's a style of writing, or the dress code for your dinner party.

Aug 21, 2025 · informal (comparative more informal, superlative most informal) Not formal or ceremonious. quotations an informal get-together

An informal situation is one that is relaxed and friendly and not very serious or official. The house has an informal atmosphere.

There are ten meanings listed in OED's entry for the adjective informal, two of which are labelled obsolete. See ‘Meaning & use’ for definitions, usage, and quotation evidence.

Synonyms for INFORMAL: unconventional, unofficial, unorthodox, irregular, casual, unceremonious, heterodox, unauthorized; Antonyms of INFORMAL: formal, regular, …