adjective

liable to unpredictable variation.

the weather will be changeable with rain at times

variable,inconstant,varying,changing,shifting,fluctuating,irregular,erratic,wavering,vacillating,inconsistent,fluid,floating,unsteady,unfixed,uneven,unstable,unsettled,turbulent,movable,mutable,chameleon-like,fickle,capricious,temperamental,whimsical,ever-changing,kaleidoscopic,volatile,mercurial,fitful,uncertain,unpredictable,undependable,unreliable,up and down,full of ups and downs,peaky,blowing hot and cold,vicissitudinous,protean,chameleonic,changeful,fluctuant,variational