gritrock, sand, guts, gritstone, gumption, backbone, wheelswarf, swarf, road grit, grind, more...

softness, soft, pliability, pliancy

sand, gravel, pebbles, rocks, dirt, dust, more...

fine, coarse, true, calcareous, more, sheer, hard, little, abrasive, clear, real

sheer determination,   abrasive particles,   grits teeth,   clench teeth,   rugged character,   say through teeth,   grim determination,   unwelcome pellets,   mental toughness,   angry determination