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1. 非典型的：有些老年忧郁症的表现是非典型的 (atypical),通常表现不明显的忧郁情绪 (depression without sadness),而是易怒、抱怨记忆力变差,身体不适、慢性疼痛、虑病 (hypochondriasis) 的现象等.

2. 非典型的;不规则的;不正常的：atypical plant community 异常植物群 | atypical 非典型的;不规则的;不正常的 | Au 金

3. 非典型肺炎：22. 肺炎 Pneumonia | 23. 非典型肺炎 Atypical | 25. 流鼻水 Running Nose

1. 非典型的
    Someone or something that is atypical is not typical of its kind.

atypical的反义词

    e.g. The economy of the province was atypical because it was particularly small...
           该省的经济比较特殊，因为它的规模特别小。
    e.g. He was an atypical English schoolboy.
           他跟一般的英国男学生不太一样。

1. deviating from normal expectations
    somewhat odd, strange, or abnormal

    e.g. these days large families are atypical
           atypical clinical findings
           atypical pneumonia
           highly irregular behavior

    Synonym: irregular

2. not representative of a group, class, or type

    e.g. a group that is atypical of the target audience
           a class of atypical mosses
           atypical behavior is not the accepted type of response that we expect from children

    Synonym: untypical