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Definition of toughened : of Toughen

Synonyms:

problematical, burned, thickened, enured, treated, problematic, hard, annealed, sunbaked, bad, tough, rugged, baked, ruffianly, case-hardened, burnt, hard-boiled, inured, sturdy, knotty, set, weather-beaten, elusive, baffling, calloused

propped, reinforced, braced, empowered, hardened, buttressed, invigorated, fortified, energized, supported, enlivened, tempered, vivified, strengthened

Usage examples:

• 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 nomads were trained and toughened by their weeks of fight for survival, but Mayfield's men were only weakened by their strained effort to keep the town alive. - "The Year When Stardust Fell", Raymond F. Jones.
• He soon had the knack of that: his muscles were toughened already. - "The Reign of Law A Tale of the Kentucky Hemp Fields", James Lane Allen.