adjective
1.
Synonyms: giddy 1, bird-witted, dizzy, empty-headed, flighty, frivolous, harebrained, light-headed, rattlebrained, scatterbrained
Related Word: irresponsible, undependable, unreliable
2.
Synonyms: excitable , agitable, alarmable, combustible, edgy, skittery, startlish, volatile
Related Word: restive; nervous