illegitimate

adjective

il·​le·​git·​i·​mate ˌi-li-ˈji-tə-mət 

1

a

: not recognized as lawful offspring

b

: born of parents not married to each other

2

a

: not sanctioned by law : illegal

b

: not authorized by good usage

c

of a taxon : published but not in accordance with the rules of the relevant international code

3

: not rightly deduced or inferred : illogical

4

: departing from the regular : erratic

illegitimately adverb

Synonyms

• baseborn
• misbegotten
• natural
• spurious
• supposititious
• unfathered

Examples of illegitimate in a Sentence

She thinks that my concerns are illegitimate.

They were fired from their jobs for illegitimate reasons.

Recent Examples on the Web

The center pointed out that the website shown in the viral video is illegitimate and not run by the hotel in question. —Hannah Hudnall, USA TODAY, 9 Dec. 2024

San Diego County has made fighting the illegitimate businesses a priority and effectively eliminated them, The Times reported in June. —Connor Sheets, Los Angeles Times, 25 Sep. 2024

If recent elections are a guide, those who support the losing candidate are likely to believe that the winner is illegitimate. —Robert A. Pape, Foreign Affairs, 5 Nov. 2024

Given some room to excel, albeit in roles that beg to be more deeply explored, are Tang Shiyi as Gui Ying, a schoolteacher and martial artist with a close connection to An’s family; and Bea Hayden Kuo as Xia An, the Banker’s illegitimate daughter who is romantically involved with An. —Richard Kuipers, Variety, 4 Nov. 2024

Word History

First Known Use

1536, in the meaning defined at sense 1a

Kids Definition

illegitimate

adjective

il·​le·​git·​i·​mate ˌil-i-ˈjit-ə-mət 

1

: born of a father and mother who are not married

2

: illegal

illegitimately adverb

Legal Definition

illegitimate

adjective

il·​le·​git·​i·​mate ˌi-li-ˈji-tə-mət 

1

: not recognized by the law as offspring

specifically : born out of marriage

Note: An illegitimate child is usually legitimated by his or her parents' later marriage. Illegitimate children generally have the same inheritance rights under intestate successions as legitimate children; statutes limiting their inheritance rights have been found to violate the equal protection clause.

2

: not valid according to law

illegitimate noun