WordNet sense 1 (someone who doesn't understand what is going on):

square

WordNet sense 2 (pathetically lacking in force or effectiveness):

feeble

WordNet sense 3 (having little physical or spiritual strength):

weak

WordNet sense 4 (disabled in the feet or legs):

crippled, game, gimpy, halt, halting

WordNet sense 5 (not in good physical or mental condition; out of condition):

unfit

WordNet sense 6 (deprive of the use of a limb, especially a leg):

cripple