| buoyant(adjective, sharp, lively, changeable, sprightly) |
| changing(adjective, changeable, fickle, variable, volatile) |
| eccentric(irregular, unpredictable, unreliable) |
| elastic(adjective, lively, impulsive, unpredictable, changeable) |
| express(fast, quick, velocity, brisk, hasty) |
| fanciful(adjective, careless, unstable, unreasonable, impulsive) |
| flexible(adjective, changeable, fickle, volatile, changing) |
| flying(fast, quick, velocity, speedy, brisk) |
| freakish(adjective, change, continue, careless, unstable) |
| giddy(adjective, unpredictable, unreliable, changeable, uneven) |
| irresponsible(adjective, unstable, unsettled, unreliable, changeable) |
| lascivious(adjective, attitude, passionate, behavior, volatile) |
| lubricious(adjective, careless, lively, uncertain, active) |
| nimble(fast, quick, velocity, sprightly, supple) |
| resilient(adjective, lively, impulsive, unpredictable, changeable) |
| sharp |
| skittish(adjective, nervous, unstable, unsettled, emotional) |
| spry(adjective, sharp, lively, fast, quick) |
| undecided |
| versatile(adjective, unstable, unsettled, changeable, variable) |