Illegitimate

[adjective, noun il-i-jit-uh-mit; verb il-i-jit-uh-meyt] /adjective, noun ˌɪl ɪˈdʒɪt ə mɪt; verb ˌɪl ɪˈdʒɪt əˌmeɪt/

adjective
1.
born of parents who are not married to each other; born out of wedlock:
an illegitimate child.
2.
not legitimate; not sanctioned by law or custom.
3.
unlawful; illegal:
an illegitimate action.
4.
irregular; not in good usage.
5.
Logic. not in accordance with the principles of valid inference.
6.
Obsolete.

noun
7.
a person recognized or looked upon as illegitimate.
verb (used with object), illegitimated, illegitimating.
8.
to declare illegitimate.
/ˌɪlɪˈdʒɪtɪmɪt/
adjective
1.
born of parents who were not married to each other at the time of birth; bastard
2.
forbidden by law; illegal; unlawful
3.
contrary to logic; incorrectly reasoned
noun
4.
an illegitimate person; bastard
adj.

1530s, “born out of wedlock,” formed in English (and replacing earlier illegitime, c.1500), modeled on Latin illegitimus “not legitimate” (see il- + legitimate). Sense of “unauthorized, unwarranted” is from 1640s. Phrase illegitimi non carborundum, usually “translated” as “don’t let the bastards grind you down,” is fake Latin (by 1965, said to date from c.1939) (Carborundum was a brand of abrasives).