¿Cuál es una palabra más suave para referirse a volátil?

Volatile

Definition: Weak, airy, effervescent, expansive, fleeting, flighty, flippant, frivolous, fugacious, gaseous, giddy, impermanent, inconsistent, inconstant, lively, lubricious, mercurial, momentary, playful, short-lived, sprightly, subtle, temperamental, transitory, unsteady, up-and-down, vaporous, and whimsical.