(a.) Trembling or vaccilating, as if about to fall; unsteady; shaking.

anile battered beat-up beaten up broken-down crabbed debilitated decrepit derelict dilapidated doddered doddering doddery doubtful dubious feeble fossilized gerontal gerontic groggy in ruins infirm insecure mossbacked moth-eaten mummylike palsied papery-skinned ramshackle ravaged with age ricketish rickety rocky ruined ruinous run to seed run-down rusty senile shaky shriveled slummy spidery spindly stricken in years teetering teetery timeworn tottering treacherous tumbledown uncertain undependable unhealthy unpredictable unreliable unsafe unsound unstable unsteady unsure untrustworthy weak withered wizened wobbly