Webster’s Revised Unabridged Dictionary · 1913
Incertain
In·cer′tain (ĭn·sẽr′tĭn), n. [Pref. in- not + certain: cf. F. incertain, L. incertus. See Certain.] Uncertain; doubtful; unsteady. — In·cer′tain·ly, adv.
Very questionable and of uncertain truth. Sir T. Browne.