From answers.com: The condition or state of being incapable of
accomplishing or effecting anything: helplessness, impotence,
incapability, ineffectiveness, ineffectuality, ineffectualness,
inefficacy, powerlessness, uselessness. See affect/ineffectiveness,
strong/weak.
The condition or fact of being deficient: defect, deficiency,
deficit, insufficiency, lack, paucity, poverty, scantiness,
scantness, scarceness, scarcity, shortage, shortcoming, shortfall,
underage1. See excess/insufficiency/enough.