brittle capricious changeable corruptible deciduous dying ephemeral evanescent fading fickle fleeting flitting flying fragile frail fugacious fugitive impermanent impetuous impulsive inconstant insubstantial irresponsible momentary mortal mutable nondurable nonpermanent passing perishable short-lived temporal temporary transient transitive transitory trustless undependable undurable unenduring unfaithworthy unreliable unstable unsure untrustworthy untrusty volatile