unstable/unsteady

ambiguous borderline capricious changeable dizzy dubious erratic fickle fitful fluctuating giddy inconsistent inconstant insecure irrational lubricious mercurial mobile movable moving mutable not fixed precarious rickety risky rocky sensitive shaky shifty slippery suspect teetering temperamental ticklish tricky uncertain unpredictable unsettled untrustworthy vacillating variable volatile wavering weaving wiggly wobbly

stable steady strong