Webster's English Dictionary

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uncertain

un.cer.tain \.*n-'s*rt-*n, '*n-\ \-*n-(n)*s\ aj 1: INDETERMINATE  2: not 
   certain to occur : INDEFINITE, PROBLEMATICAL  3: not reliable : 
   UNTRUSTWORTHY  4a: not known beyond doubt : DUBIOUS  4b: not having certain 
   knowledge : DOUBTFUL  4c: not clearly identified or defined  5: not 
   constant : VARIABLE, FITFUL  - un.cer.tain.ly av