| fly-by-night(adjective, capricious, irresolute) |
| hot-tempered(adjective, passionate, nervous, restless, fiery) |
| testy(adjective, delicate, nervous, sensitive, irritable) |
| elastic(adjective, strong, hard, tough, lively) |
| evaporable(adjective, vaporization, gaseity) |
| ever changing |
| fading(adjective, brief, transient, transitory, short-lived) |
| fanciful(adjective, free, careless, wild, unstable) |
| flickering(adjective, irregular, changeable, variable, transient) |
| impetuous(adjective, nervous, unstable, restless, unreliable) |
| irregular(adjective, lively, active, unstable, unsettled) |
| irresponsible(adjective, unstable, unsettled, unreliable, changeable) |
| irritable(adjective, weak, delicate, passionate, anxious) |
| moody(adjective, careless, unstable, unreasonable, restless) |
| short-tempered(adjective, quick, fiery, temperamental, excitable) |
| short-term(adjective, temporary, transient) |
| sprightly(adjective, pleasure, happy, lively, glad) |
| vaporous(adjective, unstable, unpredictable, changeable, airy) |
| brief(adjective, present, short, limited, temporary) |
| cranky(adjective, delicate, sensitive, irritable, tricky) |