Of facts or matters of knowledge: Unknown; also, not certainly known, uncertain. Obsolete.

Not known with certainty; not established or proved beyond doubt; doubtful, dubious.

Uncertain.

Subject to doubt or uncertainty; not fixed, sure, or certain; doubtful.

Not certain; = uncertain, adj. (in various senses).

Uncertain.

Uncertain, doubtful. Obs.

Const. of, or to with infinitive.

Of evidence, manifestations, etc.: Of uncertain bearing or significance.

Involving or giving rise to problems or questions; of which the nature is unsettled.

colloquial (originally U.S.). Spoiled, esp. by being badly managed or handled; messed up, ruined. Also: confused, mistaken. Cf. to screw up 10a at…