Find Antonyms

undefined Antonyms

Opposite of undefined

Because the opposite of undefined shifts with each meaning, the 9 antonyms and opposite words below are separated across 2 exact definitions and ranked by contrast strength.
JUMP TO:

• adjective (Context 1)

Not clear or precisely defined; lacking definite limits, form, or explanation.

Usage Example

"The boundaries between the two administrative districts remained largely defined for decades."

Strongest
defined
definite
explicit
Strong
clear-cut
specific
precise
distinct

• adjective (Context 2)

Having no valid meaning, assigned value, or interpretation within a mathematical system or computer program (such as the result of dividing a number by zero).

Usage Example

"In standard arithmetic, the expression of any number divided by zero is considered defined."

Strongest
defined
Strong
assigned
determinate

Similar words to undefined

Words similar to undefined shift depending on context. Common synonyms include:

unspecified
indeterminate
vague
indefinite
ill-defined
nebulous
ambiguous
unassigned
See all synonyms of undefined

• Nearby Words

undefiled
undefinable
undefinably
undefined
undelayed
undelete
undeleted

Cite this Entry

Wordmom. (2026). Antonyms for Undefined. In Wordmom Thesaurus. Retrieved Nov 5, 2026, from https://wordmom.com/antonyms/undefined
Built for writers, students, and competitive word game players, Wordmom combines an uncluttered English dictionary and thesaurus with fast, pattern-based word finders so you can verify definitions, synonyms, and high-scoring tile plays in one place.
Word Games & Solvers
Word FinderScrabble Word FinderWords With Friends CheatWordle SolverAnagram Solver
Dictionary & Reference
DictionarySynonymsAntonymsWords
Community
Contact UsEditorial PolicyPrivacy PolicyTerms and Conditions
© 2016–2026 Wordmom Network. All rights reserved. Made with for word lovers everywhere.
Disclaimer: SCRABBLE® is a registered trademark. All intellectual property rights in and to the game are owned in the U.S.A. and Canada by Hasbro Inc., and throughout the rest of the world by J.W. Spear & Sons Limited of Maidenhead, Berkshire, England, a subsidiary of Mattel Inc. Mattel and Spear are not affiliated with Hasbro. Words With Friends® is a registered trademark of Zynga Inc. Wordle® is a registered trademark of The New York Times Company. Other referenced game titles and tournament lexicon codes (including NASPA NWL and WESPA/HarperCollins CSW) are trademarks of their respective owners. Wordmom is an independent reference utility for educational and entertainment purposes and is not affiliated with, sponsored by, or endorsed by Hasbro, Mattel, Spear, Zynga, The New York Times Company, NASPA, WESPA, or HarperCollins Publishers. All game names are referenced strictly under nominative fair use to indicate compatibility.