(a.) Not daunted; not subdued or depressed by fear.

assiduous audacious bold constant continuing courageous dauntless diligent dogged enduring faithful fearless immutable inalterable indefatigable indomitable industrious insistent intrepid invincible lasting loyal never-tiring obstinate patient patient as Job permanent perseverant persevering persistent persisting pertinacious plodding plugging preoccupied rapt relentless resolute sedulous single-minded sleepless slogging stable steadfast steady stubborn tenacious tireless unabashed unabating unappalled unawed unblenching unblinking unconquerable uncowed uncringing undiscouraged undismayed undrooping unfailing unfaltering unflagging unflinching unintermitting uninterrupted unintimidated unnodding unrelaxing unrelenting unremitting unshrinking unsleeping unswerving untiring unwavering unwearied unwearying unwinking utterly attentive valiant valorous weariless