futile

Synonyms: abortive barren bootless delusive empty exhausted forlorn fruitless hollow idle impracticable impractical ineffective ineffectual insufficient in vain no dice nugatory on a treadmill otiose out the window profitless resultless save one’s breath sterile to no avail to no effect to no purpose trifling trivial unavailing unimportant unneeded unproductive unprofitable unreal unsatisfactory unsubstantial unsuccessful useless vain valueless worthless

Antonyms: fruitful hopeful productive profitable