Synonyms of diligent

1 Syllable

grind

2 Syllables

earnest, come-through, hellbent, busiest, studious, steadfast, grinder, in-depth, plugging, gumptious, constant, busier, busy, eager

3 Syllables

active, laborious, occupied, unflagging, persistent, industrious, tireless, fussbudget, hard-working, conscientious, painstaking, unfailing, assiduous, careful, sedulous, unwearying, hardworking, persisting, engrossed, untiring, intense

4 Syllables

unretiring, undistracted, unrelenting, operose, expeditious, pertinacious, attentive, all-consuming, undivided, enterprising

5 Syllables

businesslike

6 Syllables

indefatigable