informal

adj.

1. Not formal or ceremonious; casual: an informal gathering of friends; a relaxed, informal manner.
2. Not being in accord with prescribed regulations or forms; unofficial: an informal agreement.
3. Suited for everyday wear or use: informal clothes.
4. Being more appropriate for use in the spoken language than in the written language.

informally in·for'mal·ly adv.

adjective

1. Unconstrained by rigid standards or ceremony: casual, easy, easygoing, natural, relaxed, spontaneous, unceremonious, unrestrained. Informal laid-back. See plain/fancy, tighten/loosen.
2. In the style of conversation: chatty, colloquial, confabulatory, conversational. See words.

adj

Definition: casual, simple
Antonyms: buttoned-up, ceremonious, dressed-up, formal, official, rigid, stiff

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IN BRIEF: Without ceremony, casual.

After his speech, the professor led an informal discussion of the issues.

Dansk (Danish)
adj. - uformel, tvangfri, formløs, uofficiel

Nederlands (Dutch)
informeel, ongedwongen, onofficieel

Français (French)
adj. - sans façons, simple, familier, informel, sans cérémonie, décontracté, officieux, verbal

Deutsch (German)
adj. - ungezwungen, formlos

Ελληνική (Greek)
adj. - ανεπίσημος, φιλικός, μη τυπικός, παράτυπος

Italiano (Italian)
spontaneo, informale

Português (Portuguese)
adj. - informal

Русский (Russian)
неофициальный

Español (Spanish)
adj. - sencillo, sin etiqueta, sin cumplido, familiar, extraoficial, no oficial

Svenska (Swedish)
adj. - informell, inofficiell, kamratlig, anspråkslös, osymmetrisk, formlös

中文（简体）(Chinese (Simplified))
非正式的, 通俗的, 不拘礼的

中文（繁體）(Chinese (Traditional))
adj. - 非正式的, 通俗的, 不拘禮的

한국어 (Korean)
adj. - 비공식의, 격식 차리지 않는, (말 등이) 회화체의

日本語 (Japanese)
adj. - 正式でない, 非公式の, 略式の, 打ち解けた, くつろいだ, 口語的な

العربيه (Arabic)
‏(صفه) غير رسمي, عامي‏

עברית (Hebrew)
adj. - ‮לא רשמי, לא פורמלי, יום-יומי (דיבור, לבוש)‬

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informal sports