1. (a.) Not confident of safety or permanence; distrustful\; suspicious; apprehensive of danger or loss.

2. (a.) Not effectually guarded, protected, or sustained; unsafe; unstable; exposed to danger or loss.

afraid anxious apprehensive dangerous desultory dickey disconcerted doubtful dubious exposed fearful flimsy fluctuant frail hazardous hesitant in suspense infirm insubstantial jumpy nervous open perilous precarious provisional questioning rickety risky rocky rootless shaky shifting shifty slippery temporary tentative ticklish tottery treacherous unassured uncertain uncomfortable unconfident undefended undependable unfaithworthy unguarded unhealthy unnerved unpredictable unprotected unreliable unsafe unselfassured unselfconfident unselfreliant unsolid unsound unstable unsteadfast unsteady unsubstantial unsure untrustworthy vacillating vulnerable wavering weak wobbly worried