Synonyms of undefined

undefined

adjective

ˌən-di-ˈfīnd 

as in vague

not seen or understood clearly

plagued by undefined worries that kept her awake at night

Synonyms & Similar Words

• vague
• faint
• hazy
• undetermined
• unclear
• indistinct
• nebulous
• indefinite
• fuzzy
• pale
• obscure
• shadowy
• opaque
• blurry
• indistinguishable
• murky
• dark
• foggy
• misty
• dim
• bleary
• invisible
• blear
• intangible
• dusky
• gauzy
• mysterious
• inexplicable
• gloomy
• incomprehensible
• impalpable
• puzzling
• inappreciable
• indiscernible
• indecipherable
• hieroglyphic
• obfuscatory

Antonyms & Near Antonyms

• clear
• definite
• distinct
• obvious
• certain
• evident
• plain
• bright
• pellucid
• strong
• sure
• firm

Example Sentences

Recent Examples of undefined

Though editor Yorgos Mavropsaridis (a Yorgos Lanthimos regular) cuts the film with brisk concision, there’s also a welcome temporal elasticity here — the sense that life can change in the blink of an eye, but also stall for undefined passages. — Guy Lodge, Variety, 19 June 2026

Well, the Thirteenth Amendment left the country with 4 million freed slaves, undefined. — David Frum, The Atlantic, 10 June 2026

Those that hand a broken or undefined process to an agent typically get faster, more consistent failures. — Rhett Power, Forbes.com, 7 June 2026

The bodies float in an undefined space, at once intimate and strangely cosmic. — George Nelson, ARTnews.com, 8 May 2026