| involuntary(passionate, violent, thoughtless, abrupt, impetuous) |
| irregular(lively, unpredictable, changeable, uneven, temperamental) |
| irrepressible(lively, unpredictable, changeable, temperamental, resilient) |
| jumping the gun(expression, idiom, passionate, violent, thoughtless) |
| lighthearted(lively, unpredictable, changeable, temperamental, resilient) |
| lively(impulsive, unpredictable, changeable, resilient, explosive) |
| longitudinal(adjective, vertical) |
| lubricious(lively, impulsive, unpredictable, changeable, temperamental) |
| mad(passionate, violent, lively, thoughtless, changeable) |
| mercurial(adjective, lively, impulsive, unpredictable, changeable) |
| mobile(lively, unpredictable, changeable, temperamental, resilient) |
| movable(lively, unpredictable, changeable, temperamental, resilient) |
| offhand(thoughtless, impetuous, unwary) |
| orthodiagonal |
| orthogonal |
| passionate(violent, thoughtless, abrupt, impetuous, unwary) |
| plumb |
| plunging |
| precipitate(passionate, violent, thoughtless, abrupt, impetuous) |
| precipitous |