most ineffective

abortive anticlimactic barren bootless defeasible feckless feeble forceless fruitless futile idle impotent inadequate incompetent indecisive inefficacious inefficient inept inferior innocuous inoperative invertebrate lame limited neutralized nugatory null null and void paltry powerless spineless unable unavailing unfruitful unproductive unprofitable unsuccessful vain void withered worthless

competent effective effectual efficient powerful strong useful

feeble fruitless futile impotent inadequate incompetent indecisive ineffectual inefficient inept limited null powerless unable unproductive unprofitable unsuccessful worthless

abortive anticlimactic barren bootless defeasible emasculate feckless forceless idle inefficacious inferior innocuous inoperative lame neutralized no go no way not effective nugatory paltry slack-spined spineless unavailable unavailing unfruitful vain void withered

able adequate capable competent dexterous effective effectual efficient expert fit fruitful potent powerful productive profitable skillful strong successful sufficient useful valuable worthwhile worthy