Ĕv'a-nēs'cent, a.

a. [Lat. evanescens, p. pr. of evanescere.]

1. Liable to vanish or pass away like vapor; vanishing; fleeting; as, evanescent pleasures.
2. Vanishing from notice; imperceptible.

The difference between right and wrong, in some petty cases, is almost evanescent. Wollaston.