WordNet sense 1 (short):

shy

WordNet sense 2 (not enough; hard to find):

scarce

WordNet sense 3 (less than the correct or legal or full amount often deliberately so):

scant, short

WordNet sense 4 (not sufficient to meet a need):

inadequate, poor

WordNet sense 5 (of a quantity not able to fulfill a need or requirement):

insufficient

WordNet sense 6 (falling short of some prescribed norm):

inferior, substandard

WordNet sense 7 (varying from or not adhering to a standard):

nonstandard

WordNet sense 8 (inadequate in amount or degree):

lacking, wanting