evanescent

In a sentence.

1. 01

   An evanescent rainbow appeared in the spray and vanished.

2. 02

   The concert left an evanescent echo in the empty hall.

Where it came from.

Evanescent reached English through French from Latin ēvānēscēns, ‘vanishing,’ from a verb meaning ‘to fade away.’

Why it’s interesting.

It suits things whose beauty depends on their brief life, such as mist, light, and passing sounds.