Synonyms for useless
modified
Unserviceable
worthless, unusable, inutile, ineffectual, expendable, incompetent, of no use, ineffective, inoperative, broken, dysfunctional, counterproductive, inefficient, unprofitable, no damn good*.
Antonyms efficient*, usable, operative.
Futile
futile, vain, unavailing, fruitless; see hopeless 2. See syn. study at futile.
See useless in Webster's New World Roget's A-Z Thesaurus II
adjective
Having no useful purpose:
ineffectual, inutile, unusable, worthless. See usedIncapable of being used or availed of to advantage:
impracticable, impractical, unnegotiable, unserviceable, unusable, unworkable. See usedHaving no useful result:
barren, bootless, fruitless, futile, unavailing, unprofitable, unsuccessful, vain. Idiom: in vain. See thrive, usedNot having the desired effect:
ineffective, ineffectual, inefficacious, inefficient. See affect
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