Same word as volative:

agitable, alarmable, capricious, changeable, combustible, dizzy, edgy, excitable, excited, fearful, fickle, fidgety, flighty, frivolous, giddy, harebrained, high-strung, irresponsible, jumpy, lightheaded, lively, peppy, playful, restive, scatterbrained, sensitive, spirited, undependable, unreliable, volative, whimsical, zippy