Diligence is a quality of hard work and dedication to a task. It is often associated with words such as 'INDEFATIGABLE' (13 letters), meaning tireless, 'PAINSTAKING' (11 letters), meaning done with great care and effort, 'EARNEST' (7 letters), meaning serious and sincere, 'ACTIVE' (6 letters), meaning characterized by action, 'LABORIOUS' (9 letters), meaning requiring much work and effort, 'ENTERPRISING' (12 letters), meaning having initiative and resourcefulness, 'ATTENTIVE' (9 letters), meaning paying close attention, 'BUSY' (4 letters), meaning actively engaged in an activity, 'INDUSTRIOUS' (11 letters), meaning hardworking and productive, 'CONSCIENTIOUS' (13 letters), meaning guided by a sense of right and wrong, 'ASSIDUOUS' (9 letters), meaning showing great care and perseverance, 'SEDULOUS' (8 letters), meaning persistent in effort, 'ZEALOUS' (7 letters), meaning full of enthusiasm and eagerness, and 'STUDIOUS' (8 letters), meaning devoted to studying. All of these words are related to the concept of diligence and can be used to describe someone who is hardworking and dedicated to their tasks.