Illegitimate Definition

ĭlĭ-jĭtə-mĭt
adjective
Not in keeping with accepted usage.
Webster's New World
Contrary to law or rules; illegal; unlawful.
Webster's New World
Not valid or defensible.
Their reasons for missing school are illegitimate.
American Heritage Medicine
Incorrectly deduced: not logical.
An illegitimate conclusion.
Webster's New World
Born of parents not married to each other.
Webster's New World