1) (a game played on) a long plank with a person sitting on each end which can raise and fall alternately; any up-and-down or to-and-from movement (seesaw)
(of a person, behaviour) acting on, resulting from an impulse
tending to act without thought
(of a person) often changing (in opinion, temper etc)
flighty, temperamental
(of an answer, action) not said, done etc as the result of a hint, suggestion etc
tending to act without thought
(of a line or plane) at a right angle to the earth's surface or to another line or surface
upright
(of a liquid) that easily changes into gas or vapour; (of a person, mood) changing quickly or easily from one mood or interest to another
explosive, changeable
