(a.) Incapable of being wearied.

advertent agog alert all ears all eyes ardent attentive aware careful concentrated conscious constant continuing diligent dogged earnest elaborate enduring energetic faithful fervent finical finicking finicky hard hardworking heedful immutable inalterable indefatigable indomitable industrious insistent intense intent intentive invincible laborious lasting loyal meticulous mindful never idle never-tiring nice niggling observant observing obstinate on the ball on the job open-eared open-eyed openmouthed operose painstaking patient patient as Job permanent perseverant persevering persistent persisting pertinacious plodding plugging preoccupied rapt regardful relentless resolute sedulous single-minded sleepless slogging stable steadfast steady strenuous stubborn tenacious thorough thoroughgoing tireless unabating unconquerable undaunted undiscouraged undrooping unfailing unfaltering unflagging unflinching unintermitting uninterrupted unnodding unrelaxing unrelenting unremitting unsleeping unsparing unswerving untiring unwavering unwearied unwearying unwinking utterly attentive vehement watchful weariless zealous