Fū'tile, a.

a. [Fr. & It. futile, Sp. futil, from Lat. futilis, that easily pours out, that easily lets loose, vain, worthless, from fundere, root ful, to pour out.]

1. Talkative; loquacious; tattling. [Obs.] “Talkers and futile persons.” Bacon.
2. Of no weight or importance; answering no valuable purpose; resulting in disappointment; failing of the designed effect; useless; vain; worthless; trifling. “Futile theories.” I. Taylor.

His reasoning was singularly futile. Macaulay.