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

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

The message of the Corcoran cancellation was that crossing some undefined line of decency gave the government license to come after you. — Louis Menand, New Yorker, 13 July 2026

But their relationship remains undefined, and kind of over after Carter drunkenly ruins Beulah's big party. — Bryan Alexander, USA Today, 3 July 2026