as in vague
not seen or understood clearly
plagued by undefined worries that kept her awake at night
Synonyms & Similar Words
Relevance
Antonyms & Near Antonyms
Example Sentences
Examples are automatically compiled from online sources to
show current usage.
Read More
Opinions expressed in the examples do not represent those of Merriam-Webster or its editors.
Send us feedback.
Recent Examples of undefined
Sid Vangala, senior AI systems engineer and architect at MasTec, said the industry is entering an era where responsibility boundaries are completely undefined.
—
Arthur Zaczkiewicz, Footwear News, 20 Apr. 2026
Leave ownership undefined, and the moon will become a playground for politicians and their cronies.
—Antony Davies, Boston Herald, 19 Apr. 2026
Transit conditions, toll arrangements and the legal framework for passage remain undefined, deterring ship owners from passing through the waterway, according to maritime research firm Windward.
—Anniek Bao,joseph Wilkins, CNBC, 9 Apr. 2026
In most cases, their roles are undefined, though a number are clearly there to deliver on Kennedy’s efforts to rewrite vaccination policy in ways that downplay the importance of and sow distrust in these key public health tools.
—Helen Branswell, STAT, 30 Mar. 2026
See All Example Sentences for undefined
Arthur Zaczkiewicz, Footwear News, 20 Apr. 2026
Leave ownership undefined, and the moon will become a playground for politicians and their cronies.
—Antony Davies, Boston Herald, 19 Apr. 2026
Transit conditions, toll arrangements and the legal framework for passage remain undefined, deterring ship owners from passing through the waterway, according to maritime research firm Windward.
—Anniek Bao,joseph Wilkins, CNBC, 9 Apr. 2026
In most cases, their roles are undefined, though a number are clearly there to deliver on Kennedy’s efforts to rewrite vaccination policy in ways that downplay the importance of and sow distrust in these key public health tools.
—Helen Branswell, STAT, 30 Mar. 2026
See All Example Sentences for undefined
Recent Examples of Synonyms for undefined
Adjective
-
Two Chinese defense companies have issued vague statements that together point to a possible new long-distance shooting record, although neither has provided technical specifications or independently verifiable data.—
Bojan Stojkovski,
Interesting Engineering,
16 May 2026
-
Teenagers often respond better to concrete information than vague warnings.—
Katia Hetter,
CNN Money,
15 May 2026
Adjective
-
Looking beyond the main structure captured by Webb, the galaxy’s spiral arms extend into a faint, wide ring of hydrogen gas stretching thousands of light-years.—
Bojan Stojkovski,
Interesting Engineering,
10 May 2026
-
Meucci started seeing bright lights and feeling faint.—
Chris Hoffman,
CBS News,
9 May 2026
Cite this Entry
“Undefined.” Merriam-Webster.com Thesaurus, Merriam-Webster, https://www.merriam-webster.com/thesaurus/undefined. Accessed 17 May. 2026.
Copy CitationLove words? Need even more definitions?
Merriam-Webster unabridged
