Adjective uncertain has 9 senses
  1. uncertain, unsure, incertain - lacking or indicating lack of confidence or assurance; "uncertain of his convictions"; "unsure of himself and his future"; "moving with uncertain (or unsure) steps"; "an uncertain smile"; "touched the ornaments with uncertain fingers"
    Antonyms: certain, sure, convinced, positive, confident
  2. uncertain - not established beyond doubt; still undecided or unknown; "an uncertain future"; "a manuscript of uncertain origin"; "plans are still uncertain"; "changes of great if uncertain consquences"; "without further evidence his story must remain uncertain"
    Antonyms:
    certain, definite, indisputable, sure, sure as shooting
  3. unsealed, uncertain - not established or confirmed; "his doom is as yet unsealed"
  4. uncertain - not firm or secure; "balancing three boxes in an uncertain pile"
    Antonym:
    secure (indirect, via insecure)
  5. uncertain - not certain to occur; not inevitable; "everything is uncertain about the army"; "the issue is uncertain"
    Antonyms:
    certain, sure, bound, destined, doomed, fated, foreordained, predestinate, predestined, in for
  6. changeable, uncertain, unsettled - subject to change; "a changeable climate"; "the weather is uncertain"; "unsettled weather with rain and hail and sunshine coming one right after the other"
    Antonym: invariable (indirect, via variable)
  7. uncertain, unsure - not safe from danger or mishap; "faced an uncertain future"; "an unsure existence"
    Antonym: secure (indirect, via insecure)
  8. uncertain - not consistent or dependable; "an uncertain recollection of events"; "a gun with a rather uncertain trigger"
    Antonyms:
    reliable, dependable (indirect, via unreliable, undependable)
    Antonyms: reliable, dependable (indirect, via unreliable, undependable)
  9. uncertain - ambiguous (especially in the negative); "she spoke in no uncertain terms"
    Antonym:
    unambiguous (indirect, via ambiguous)
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