adjective
1.
Synonyms: futile , abortive, bootless, fruitless, ineffective, ineffectual, unavailable, unavailing, unproductive, vain
Antonyms: useful
2.
Synonyms: impracticable 2, impractical, nonfunctional, unfunctional, unserviceable, unusable, unworkable
Antonyms: useful
3.
Synonyms: feckless 1, fustian, good-for-nothing, meaningless, purposeless, unpurposed, worthless