[un.cer.tain] adj (14c) 1: indefinite, indeterminate "the time of departure is ~"
2: not certain to occur: problematical
3: not reliable: untrustworthy
4. a: not known beyond doubt: dubious b: not having certain knowledge: doubtful c: not clearly identified or defined
5: not constant: variable, fitful -- un.cer.tain.ly adv -- un.cer.tain.ness n