Definition of toughened:
elusive, hard, enured, problematical, problematic, rugged, baffling, sturdy, annealed, sunbaked, weather-beaten, baked, knotty, inured, burned, ruffianly, tough, hard-boiled, burnt, hardened, tempered, thickened, treated, calloused, bad, set, case-hardened.
This old world's day is now passed, and I realize in that fact the reason for its unseemly behavior, first knocking its toughened crust so rudely against the earth and then coquetting in this manner with Mars.- "Daybreak: A Romance of an Old World", James Cowan.
- "The Year When Stardust Fell", Raymond F. Jones.
- "The Reign of Law A Tale of the Kentucky Hemp Fields", James Lane Allen.