- born of parents who are not married to each other; born out of wedlock: an illegitimate child.
- not legitimate; not sanctioned by law or custom.
- unlawful; illegal: an illegitimate action.
- irregular; not in good usage.
- Logic. not in accordance with the principles of valid inference.
- Obsolete. (formerly, in London)
- of or relating to stage plays in which musical numbers were inserted because of laws that gave only a few theaters the exclusive right to produce straight dramas.
- acting in or producing such productions.
- a person recognized or looked upon as illegitimate.
- to declare illegitimate.
Origin of illegitimate
SynonymsSee more synonyms for on Thesaurus.com
Examples from the Web for illegitimate
She was also an autodidact, an illegitimate girl from the provinces whose intelligence became the stuff of legend.Sor Juana: Mexico’s Most Erotic Poet and Its Most Dangerous Nun
November 8, 2014
You should be so proud of yourself working for an illegitimate rag like the Daily Beast.Dear Moon Landing Deniers: Sorry I Called You Moon Landing Deniers
July 29, 2014
But a large majority also view the government in Kiev as illegitimate.Ukraine Foreign Minister Speaks of Mistrust—and a Truce
April 19, 2014
Britain is not illegitimate because it has a cross on its flag and an Anglican head of a state.
Germany is not illegitimate because its immigration policy favors members of a dominant ethnic group.
Who he is no one exactly knows; some say an illegitimate son of Beckendorff.Vivian Grey
Earl of Beaconsfield, Benjamin Disraeli
The fate of illegitimate children who are "farmed out" is still worse.
Girls who have illegitimate children often lose their situations and their honor.
I am haunted by the thought of that illegitimate child of my husband's.Fruitfulness
The Latin is illegitimate; and he infers that, therefore, the English is the same.The Verbalist
Thomas Embly Osmun, (AKA Alfred Ayres)
- born of parents who were not married to each other at the time of birth; bastard
- forbidden by law; illegal; unlawful
- contrary to logic; incorrectly reasoned
- an illegitimate person; bastard
Word Origin and History for illegitimate
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).