not able to be predicted.
"the unpredictable weather of the Scottish islands"
คำพ้องความหมาย: unforeseeable, uncertain, unsure, doubtful, dubious, iffy, dicey, in the balance, up in the air; erratic, moody, volatile, unstable, capricious, temperamental, mercurial, changeable, variable, 'on-again, off-again'