Word Explorer

Undefined

Lacking a definition or value.

📖 Definitions of "Undefined"

adjective

1
Lacking a definition or value.
2
That does not have a meaning and is thus not assigned an interpretation.
"The result of division by zero is undefined."

3 synonyms found via WordNet and Google Books.

Word	Definition
vagueverb	Not clearly expressed; stated in indefinite terms.
indefinablenoun	That which cannot be precisely defined or put into words.
undefinablenoun	Not definable.

Words with the opposite meaning.

Word	Definition
defined	Having a definition or value.

Found via reverse dictionary — words that share a conceptual meaning.

Word	Definition
indefinable	That which cannot be precisely defined or put into words.
undefinable	Not definable.
vague	Not clearly expressed; stated in indefinite terms.
unspecified	Not specified; not thoroughly explained or detailed; not adequately commented.
unidentified	Not identified; having an unknown or unnamed identity.
unknown	(sometimes postpositive) Not known; unidentified; not well known.
indeterminate	Not accurately determined or determinable.
undetermined	Not determined; not settled; not decided.
unsorted	Not in any particular order or sequence.
unallocated	That has not yet been allocated.
open-ended	Unrestricted by definite limits.
unlimited	limitless or without bounds; unrestricted
imprecise	Not precise or exact; containing some error or uncertainty.
infinite	Boundless, endless, without end or limits; innumerable.
inaccurate	Mistaken or incorrect; not accurate.
uncertain	Not certain; unsure.
unclear	Not clearly or explicitly defined.
indefinite	Without limit; forever, or until further notice; not definite.
ill-defined	Poorly defined; blurry, out of focus; lacking a clear boundary.
defineverb	To state the meaning of a word, phrase, sign, or symbol.