born to parents who are not married to each other 私生的；非婚生的 - (formal)
not allowed by a particular set of rules or by law 不符合规定的；非法的 illegitimate use of company property 不正当使用公司财产
Oxford Collocations Dictionaryverbs- be
- consider something
- regard something as
- …
- completely
opposite legitimate
Word Originmid 16th cent.: from late Latin illegitimus (from in- ‘not’ + legitimus ‘lawful’), suggested by legitimate.