keeps one nose to the grindstone (verb) keep one's nose to the grindstone: work doggedly
Sinonime: belligerent, contumacious, declinatory, declining,
divergent,
impatient,
irregular,
negative, objecting,
rebellious,
recalcitrant, refractory, refusing, restive,
truculentAntonime: compliant,
obedient,
subservient,
willing