虚弱

weak / in poor health

emptiness / void / abstract theory or guiding principles / empty or unoccupied / diffident or timid / false / humble or modest / (of health) weak / virtual / in vain

weak / feeble / young / inferior / (following a decimal or fraction) slightly less than

weak; feeble / young / inferior; not as good as / (following a decimal or fraction) slightly less than