Diligent1. (a.) Prosecuted with careful attention and effort; careful; painstaking; not careless or negligent.
2. (a.) Interestedly and perseveringly attentive; steady and earnest in application to a subject or pursuit; assiduous; industrious.
Thesaurus Entries
academic, advertent, agog, alert, all ears, all eyes, ardent, assiduous, attentive, aware, bookish, careful, concentrated, conscientious, conscious, constant, continuing, devoted to studies, dogged, donnish, dryasdust, earnest, elaborate, enduring, energetic, faithful, fervent, finical, finicking, finicky, hard, hard-working, hardworking, heedful, immutable, inalterable, indefatigable, indomitable, industrious, insistent, intense, intent, intentive, invincible, laborious, lasting, loyal, mandarin, meticulous, mindful, never idle, never-tiring, nice, niggling, observant, observing, obstinate, on the ball, on the job, open-eared, open-eyed, openmouthed, operose, owlish, painstaking, patient, patient as Job, pedantic, permanent, perseverant, persevering, persistent, persisting, pertinacious, plodding, plugging, preoccupied, professorial, punctilious, rabbinic, rapt, regardful, relentless, resolute, scholarly, scholastic, scrupulous, sedulous, single-minded, sleepless, slogging, stable, steadfast, steady, strenuous, stubborn, studious, 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