resultless

result +‎ -less

resultless (not comparable)

1. Without result; lacking effect, success or accomplishment; fruitless.

   The search was resultless. Not only were no bodies or wreckage recovered but no trace was ever found.

   • 1933, Robinson Jeffers, “Antrim”, in The Selected Poetry of Robinson Jeffers‎, New York: Random House, published 1937, page 473:

     Here in the narrow passage and the pitiless north, perpetual / Betrayals, relentless resultless fighting.

• lusterless, lustreless