DictionaryillegitimateLacking validity
adjective / noun

illegitimate

il-uh-JIT-uh-mut/ˌɪləˈdʒɪtəmət/

Not recognized as lawful or justified under prevailing rules.

The fake permit is illegitimate, with a stamp that fails to match official records.

Fake permit with mismatched stamp rejected beside genuine official record.
Etymology

The base comes from a verb meaning “make lawful.” Its negative first described birth outside lawful marriage, then broadened to things lacking authorization or accepted standing.

In context

N. Stephan Kinsella87:39
It’s either valid or invalid or legitimate or illegitimate, just or unjust on its own terms.
Kinsella on Liberty-KOL237-Intellectual Nonsense: Fallacious Arguments for IP—Part 2 Libertopia 2012

More examples

  • Protesters call the government illegitimate because the election was rigged.
  • Personal expenses are an illegitimate use of these public funds.
  • Calling a child an illegitimate is dated and often offensive.

Forms

illegitimate · illegitimates

illegitimacy noun — The state of lacking lawful or justified standing.

illegitimately adverb — In a way lacking lawful or justified standing.

Similar words

unlawful
Specifically violates the law, rather than merely lacking justification.
invalid
Lacks legal force or fails to meet required standards.
unjustified
Lacks adequate reasons or evidence, without necessarily violating rules.