INCONSTANT

adj. changeable, mutable, fickle, capricious, mercurial, volatile, vacillating, unsteady, unsteadfast, irresolute, unreliable, undependable, fluctuating, wavering, erratic, inconsistent, flighty, unstable, unsettled, fitful, vague, indefinite, variable, moody His supporters proved inconstant, and he fell from power The inconstant wind blew their craft hither and thither.