4. (adj)ephemeral, passing, short-lived, transient, transitory, fugacious lasting a very shorttime "the ephemeral joys of childhood"; "a passing fancy"; "youth's transient beauty"; "love is transitory but it is eternal"; "fugacious blossoms"
Definition of 'Transient'
Webster Dictionary
1. (adj)Transient passing before the sight or perception, or, as it were, moving over or across a space or scene viewed, and then disappearing; hence, of short duration; not permanent; not lasting or durable; not stationary; passing; fleeting; brief; transitory; as, transientpleasure
2. (adj)Transient hasty; momentary; imperfect; brief; as, a transientview of a landscape