undefined Synonyms & Antonyms
What Is Another Word for Undefined?
Common synonyms for undefined are indefinite and undefinable. A word with the opposite meaning is defined.
Choose a meaning, then find a word that fits your sentence.
Undefined as an Adjective
Lacking a definition or value.
That does not have a logically sound meaning within a specific formal system and is thus not assigned an interpretation.
The result of division by zero is undefined.
That behaves unreliably due to dependence on an uninitialized value or inconsistently ported code.
In C, relying on a variable's value right after a malloc call is undefined behvaior.
That does not have a meaning and is thus not assigned an interpretation.
The result of division by zero is undefined.
Synonyms & similar words
Antonyms & near antonyms
Undefined as a Noun
An undefined value.
Undefined in a Sentence
The result of division by zero is undefined.
Within the set of real numbers, the square root of a negative number is undefined.
In C, relying on a variable's value right after a malloc call is undefined behvaior.
Word Forms & Grammar
undefined (not comparable)
undefined (plural undefineds)
Words That Rhyme With Undefined
Origin of Undefined
From un- + defined.
Word Facts for Undefined
| Part of speech | adjective, noun |
|---|---|
| Meaning | Lacking a definition or value |
| Synonyms | indefinite and undefinable |
| Antonyms | defined |
| Plural | undefineds |
Quick Answers About Undefined
Is undefined an adjective or a noun?
Undefined is mainly used as an adjective, but it can also be used as a noun.
What is the opposite of undefined?
The opposite of undefined is defined.
What is the plural of undefined?
The plural of undefined is undefineds.