Illegitimate
/ˌɪlɪˈdʒɪtəmɪt/
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Definition
(adj) Not conforming to known principles, or established or accepted rules or standards.
Sentence Examples
For a start, he was the illegitimate son of an unmarried mother.
The king had numerous illegitimate children with her.
CEFR Practice Quiz
The court ruled that the leader's claim to the throne was ____ and had no legal basis.