n. 不确实, 无信心, 不安全

[ noun ]
the state of being unsure of something
<noun.cognition>

Incertitude \In*cer"ti*tude\, n. [Cf. F. incertitude, LL.
incertitudo, fr. L. incertus. See {Incertain}.]
Uncertainty; doubtfulness; doubt.

The incertitude and instability of this life.
--Holland.

He fails . . . from mere incertitude or irresolution.
--I. Taylor.