assiduous (adj) - showing great care, attention, and commitment; devoted, diligent, persistent [uh-sij-oo-uhs]
BREAKDOWN: A- (near to) + SID- (to sit) + -UOUS (full of)
assiduity is close or constant attention to detail or work
“A price has to be paid for success. Almost invariably those who have reached the summits worked harder and longer, studied and planned more assiduously, practiced more self-denial, overcame more difficulties than those of us who have not risen so far.” —B. C. Forbes