adjective

Showing great care and perseverance.

she was assiduous in pointing out every feature

diligent,careful,meticulous,thorough,sedulous,attentive,industrious,laborious,hard-working,conscientious,ultra-careful,punctilious,painstaking,demanding,exacting,persevering,unflagging,searching,close,elaborate,minute,accurate,correct,studious,rigorous,particular