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Definition of toughened:

  1. of Toughen

Synonyms:

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.

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