illegitimate Definition

illegitimate
adj

1. Said of a person: born of parents who were not married to each other at the time of the birth. See also bastard.

Thesaurus: misbegotten, unlawfully begotten, baseborn, bastard, natural.
2. Said of a birth: happening outside marriage.
3. Unacceptable or not allowed, especially illegal.

Thesaurus: unlawful, contraband, illicit, illegal, wrong.
4. logic.
Not properly inferred or reasoned.
5. Improper.

Derivative: illegitimacy
noun

Derivative: illegitimately
adverb

Etymology: 16c: from Latin illegitimus.