Princeton's WordNet

1. uncertain, unsure, incertain(adj)

   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"

2. uncertain(adj)

   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 consequences"; "without further evidence his story must remain uncertain"

3. unsealed, uncertain(adj)

   not established or confirmed

   "his doom is as yet unsealed"

4. uncertain(adj)

   not certain to occur; not inevitable

   "everything is uncertain about the army"; "the issue is uncertain"

5. changeable, uncertain, unsettled(adj)

   subject to change

   "a changeable climate"; "the weather is uncertain"; "unsettled weather with rain and hail and sunshine coming one right after the other"

6. uncertain(adj)

   not consistent or dependable

   "an uncertain recollection of events"; "a gun with a rather uncertain trigger"

7. uncertain(adj)

   ambiguous (especially in the negative)

   "she spoke in no uncertain terms"

Kernerman English Learner's Dictionary

1. uncertain(adjective)ʌnˈsɜr tn

   ≠ certain

   I'm uncertain about what to do next.; He was feeling uncertain and worried.

2. uncertainʌnˈsɜr tn

   ≠ certain

   The future of the club is uncertain.

3. uncertainʌnˈsɜr tn

   not confident

   "I can try," he said with an uncertain smile.; "I don't think so," she replied uncertainly.

Wiktionary

1. uncertain(Adjective)

   not known for certain; questionable

2. uncertain(Adjective)

   not yet determined; undecided

3. uncertain(Adjective)

   variable and subject to change

4. uncertain(Adjective)

   fitful or unsteady

5. uncertain(Adjective)

   unpredictable or capricious

Webster Dictionary

1. Uncertain(adj)

   not certain; not having certain knowledge; not assured in mind; distrustful

2. Uncertain(adj)

   irresolute; inconsonant; variable; untrustworthy; as, an uncertain person; an uncertain breeze

3. Uncertain(adj)

   questionable; equivocal; indefinite; problematical

4. Uncertain(adj)

   not sure; liable to fall or err; fallible

5. Uncertain(adj)

   to make uncertain

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• incertoPortuguese (BR)
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