Word Type

Adjective

Adjective

Noun

The word "uncertain" can be used as adjective, adjective and noun.

Word Relationships

Opposites (Antonyms)

certain certain

Derived Terms

in no uncertain terms

Derived From

certain uncertainty

Related Terms

uncertainly uncertainty

Related Terms

capricious certain change determined fitful indeterminate known questionable subject uncertainly undecided unpredictable unsteady unsure variable yet

Similar Terms

ambiguous ambiguous ambivalent ambivalent chancy chancy contingent contingent doubtful doubtful dubious flukey fluky groping groping iffy indefinite indefinite indeterminate undependable undetermined unpredictable unreliable unreliable up in air up in the air variable

Synonym Network

ambiguous capricious changeable desultory doubtful dubious equivocal fitful fluctuating indefinite indeterminate indistinct insecure irregular mutable precarious problematical questionable shaky slippery unreliable unsealed unsettled

Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.