Synonyms for To no avail:

• adj.

  •fruitless (adjective)
  • infertile,
  • barren,
  • ineffectual,
  • pointless,
  • vain,
  • unfruitful,
  • unproductive,
  • unprofitable,
  • idle,
  • unsuccessful,
  • unavailable,
  • empty,
  • useless,
  • abortive.
  •futile (adjective)
  • unneeded,
  • impractical,
  • unimportant,
  • otiose,
  • hollow,
  • impracticable,
  • unreal,
  • bootless,
  • worthless,
  • delusive,
  • unsatisfactory,
  • valueless,
  • forlorn,
  • nugatory,
  • exhausted,
  • unsubstantial.
  •Other relevant words: (adjective)
  • trivial,
  • spinning one's wheels,
  • unprolific,
  • insufficient,
  • wild goose chase,
  • to no effect,
  • profitless,
  • no purpose,
  • futile,
  • save one's breath,
  • trifling,
  • on a treadmill,
  • in vain,
  • fruitless,
  • sterile,
  • no avail,
  • ineffective,
  • Resultless,
  • to no purpose,
  • unavailing,
  • on treadmill,
  • no effect,
  • Gainless,
  • no dice,
  • out the window.
  •unavailing (adjective)
  • un availing,
  • un-availing.

• Other synonyms:

  •in vain
  • vainly.
  •Other relevant words:
  • uselessly.
  •squandered
  • wasted.
  •Other relevant words (noun):
  • puny,
  • undirected,
  • inefficacious,
  • meaningless,
  • unrewarding,
  • purposeless,
  • senseless,
  • paltry,
  • of no moment,
  • insubstantial,
  • irrelevant,
  • insignificant,
  • inconsequential.

Antonyms for To no avail:

• adj.

  • fruitless
    useful, copious, successful, potent, productive, fruitful, effective, plentiful, effectual, profitable.
  • futile
    helpful, valuable, hopeful, worthwhile.