Synonyms for diligent

assiduous, attentive, careful, committed, conscientious, dedicated, determined, devoted, earnest, expeditious, hardworking, indefatigable, industrious, laborious, methodical, meticulous, painstaking, persevering, persistent, punctilious, scrupulous, sedulous, steadfast, studious, tenacious, thorough, tireless, unremitting, zealous