informal

informal
adjective
  1. having a relaxed, friendly, or unofficial style, manner, or nature
    不拘礼节的,轻松的;友好的;非官方的;非正式的
    an informal atmosphere.
    友好的气氛。
    an informal agreement between the two companies.
    两公司间的非正式协定。
    ■of or denoting a style of writing or conversational speech characterized by simpler grammatical structures, more familiar vocabulary, and greater use of idioms and metaphors
    (写作风格,谈话)非正式的,通俗的,口语化的
    ■(of dress) casual; suitable for everyday wear
    (着装)随意的,适合日常穿的
    ■(of economic activity) carried on by self-employed or independent people on a small scale, especially unofficially or illegally
    (经济活动)自发组织的(尤指非官方或非法的)
派生
informality
noun
informally
adverb
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