| hover(verb, pause, hesitate, hedge, waver) |
| humorsome(adjective, careless, unstable, unreasonable, unpredictable) |
| idiot(noun, fool, stupid, sap, yoyo) |
| imbecile |
| impulsive(adjective, careless, lively, unstable, unreasonable) |
| inconstant(adjective, careless, lively, active, unstable) |
| inflect |
| interchange |
| irregular(adjective, lively, active, unpredictable, changeable) |
| irrepressible(adjective, lively, unpredictable, changeable, temperamental) |
| jerk(yoyo, dolt, oxen) |
| kinky(adjective, careless, unstable, unreasonable, unpredictable) |
| lamebrain(noun, fool, stupid, sap, yoyo) |
| lamebrained(adjective, dull, simple, limited) |
| lighthearted(adjective, lively, unpredictable, changeable, temperamental) |
| limited |
| lubricious(adjective, careless, unstable, unreasonable, unpredictable) |
| lunkhead(noun, fool, stupid, sap, yoyo) |
| mad(adjective, lively, unpredictable, changeable, temperamental) |
| mentally defective(adjective, dull, simple, limited) |