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Synonyms
un·cer·tain (ŭn-sûŕtn)

adjective 

  1. Not known or established; questionable: domestic changes of great if uncertain consequences.
  2. Not determined; undecided: uncertain plans.
  3. Not having sure knowledge: an uncertain recollection of the sequence of events.
    1. Subject to change; variable: uncertain weather.
    2. Unsteady; fitful: uncertain light.

derivatives

un·ceŕtain·ly
adverb
un·ceŕtain·ness
noun