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

In a matter of minutes, my past and my still-undefined future crystallized. — Ayman M. Mohyeldin, Vanity Fair, 11 Sep. 2026

But the agreement subsequently collapsed as Washington and Tehran started fighting over shipping routes, which were left undefined in the deal. — Spencer Kimball,deena Zaidi, CNBC, 12 Aug. 2026

Still, despite the breakneck pace at which large language models and agentic AI are evolving, AI devices are still in the embryonic stage and very much undefined—a fact that may play to Ive’s strengths. — Emily Forlini, Fortune, 22 July 2026

Thanks to a particularly blurry playoff picture, many of the buyers and sellers remain undefined. — Patrick Mooney, New York Times, 16 July 2026