WordNet sense 1 (well below average height):

pint-size, pint-sized, sawed-off, sawn-off

WordNet sense 2 (low in stature; not tall):

short

WordNet sense 3 ((used especially of persons) of inferior size):

puny, shrimpy

WordNet sense 4 (limited or below average in number or quantity or magnitude or extent):

little, small