Find Synonyms

undefined Synonyms

Another word for undefined

Choosing another word for undefined depends on context, so the 11 synonyms and similar words below are separated across 2 exact definitions and ranked by match strength.
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• 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 unspecified for decades."

Strongest
unspecified
indeterminate
Strong
vague
indefinite
ill-defined
nebulous
ambiguous
indistinct
open-ended

• 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 indeterminate."

Strong
indeterminate
unassigned
null

Opposites of undefined

The opposite of undefined shifts depending on context. Common opposites include:

defined
definite
explicit
clear-cut
specific
determinate
assigned
precise
See all opposites of undefined

• Nearby Words

undefiled
undefinable
undefinably
undefined
undelayed
undelete
undeleted

Cite this Entry

Wordmom. (2026). Synonyms for Undefined. In Wordmom Thesaurus. Retrieved Nov 5, 2026, from https://wordmom.com/synonyms/undefined
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