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An oddball is someone who does not fit the usual pattern — the clothes, the jokes, the hobbies, the way of thinking. People often say it with a small smile, not with anger. It can name a person (“He’s an oddball”) and it can also describe things (“oddball humour”). It is informal. You would not put it in a job letter. The feeling is “strange, but we can live with it”, not “dangerous”. Friends and families use it; writing about crime usually picks a colder word.
怪人、古靈精怪的人（口語）
組成odd + ball. Odd means “not usual”. Ball here is not simply the round toy: the compound first appeared in the late 1930s for an extra ball played as a bonus in pinball-type games. By the 1940s people were using it for unusual people. The describing word (oddball ideas) showed up a little before the person-noun.
原始詞典資料3 筆記錄
以下是外部詞典記錄的用法，原文照列，我們還沒有寫成教學內容。上面的說明才是我們自己寫的；有些用法可能上面已經講過了。
oddballnoun/ˈɑːdˌbɔl/
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An eccentric or unusual person.
- Miss Quinn thought that Oswald spoke Russian well in view of his lack of formal training; she found the evening uninteresting. Donovan, with whom she had a date later, testified that she told him that Oswald was “kind of an oddball.”
- "She's different, mister. A real oddball, if you know what I mean. But your little girl would love her. All kids love the Doll Lady."
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medicineneurosciencesciencesA deviant stimulus that appears among repetitive stimuli during an experiment, to trigger an event-related potential in the participant.
oddballadj/ˈɑːdˌbɔl/
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Exotic, not mainstream.
- An oddball word processor, for example, might never be supported by such helpful tools as spelling checkers, indexing programs, footnote utilities,...
資料來源：英文維基詞典 English Wiktionary（CC BY-SA 4.0）。 原文照列，未經改寫。