inadequate

Synonyms: bare barren bush-league deficient depleted dry failing faulty feeble found wanting glitch imperfect impotent inappreciable inapt incapable incommensurate incompetent incomplete inconsiderable insubstantial junk lacking lame lemon lousy low meager minus miserly niggardly not enough parsimonious poor scanty scarce short shy sketchy skimpy small spare sparse sterile stinted stunted thin too little unequal unproductive unqualified weak

Antonyms: able adequate competent enough sufficient