From The Collaborative International Dictionary of English v.0.48 :
Incertain \In*cer"tain\, n. [Pref. in- not + certain: cf. F.
incertain, L. incertus. See Certain.]
Uncertain; doubtful; unsteady. -- In*cer"tain*ly, adv.
[1913 Webster]
Very questionable and of uncertain truth. --Sir T.
Browne.
[1913 Webster]
From WordNet (r) 3.0 (2006) :
incertain
adj 1: 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" [syn: uncertain, unsure,
incertain] [ant: certain(p), sure]