Diligent synonyms such as attentive, active, and assiduous. Diligent is an adjective, and its antonyms are lazy and casual. Additionally, here are 38 synonyms, related words, and verbs for diligent.
active, assiduous, attentive, busy, careful, committed, conscientious, constant, dedicated, dogged, driven, earnest, exacting, hard-working, heedful, indefatigable, industrious, intent, laborious, meticulous, painstaking, particular, persevering, persistent, pertinacious, plodding, punctilious, rigorous, sedulous, slogging, studious, tenacious, thorough, tireless, unflagging, untiring, and zealous.