nose to grindstone

assiduous diligent dogged energetic inexhaustible painstaking relentless tireless unflagging unwavering vigorous

active bound and determined dead set on determined hell-bent industrious ironclad patient persevering persistent pertinacious sedulous steadfast stop-at-nothing strenuous unfaltering unflinching unremitting unwearied unwearying

changing idle inactive indifferent lazy lethargic negligent tired wavering

fatigued weary

grind grunt hireling laborer menial

dogsbody factotum lackey peon plodder servant toiler worker

idler lazy person