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.
  •unavailing (adjective)
  • un availing,
  • un-availing.

• Other synonyms:

  •squandered
  • wasted.

Antonyms for To no avail:

• adj.

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