infirm

adj.

[1]	ill , decrepit , debile , indisposed , debilitated , feeble , rickety , frail , fragile , sapless , weak , weak , feeble , weakly , weakened , ailing , decrepit , enfeebled , failing , wasted , on the decline , sick , sickly , unwell , lame , crippled
[2]	shaky , flimsy , wobbly , wobbling , doddering , unstable , faltering , vacillating , wavering , unsteady , unsteadfast , inconstant , changeable , irresolute