abiding arrogant assiduous assured calm cocksure confident constant continuing convinced coolheaded decided determined diligent dogged enduring faithful firm hubristic immutable inalterable indefatigable indomitable industrious inexcitable insistent invincible lasting loyal nerveless never-failing never-tiring obstinate overconfident oversure overweening patient patient as Job permanent perseverant persevering persistent persisting persuaded pertinacious plodding plugging poised pompous positive preoccupied proud rapt reassured relaxed relentless resolute rock-steady secure sedulous self-assured self-confident self-important self-reliant single-minded sleepless slogging stable steadfast steady steady-handed steady-nerved steel-nerved stick-at-nothing strong-nerved stubborn sure tenacious tireless unabating unafraid unblenching unblinking unconquerable undaunted undiscouraged undoubting undrooping unfailing unflagging unflinching unhesitant unhesitating unintermitting uninterrupted unnervous unnodding unqualified unquestioning unquivering unrelaxing unrelenting unremitting unshaken unshaky unshrinking unsleeping unstrained unswerving untiring untremulous unwavering unwearied unwearying unwinking utterly attentive weariless wholehearted without a tremor