toughened

1. Physically toughened (synset 302456417)
   "the tough bottoms of his feet"
   also:

   • rugged - sturdy and strong in constitution or construction; enduring
   • experienced, experient - having experience; having knowledge or skill from observation or participation
   • strong - having strength or power greater than average or expected
   similar to:

   • callous, calloused, thickened - having calluses; having skin made tough and thick through wear
   • enured, hardened, inured - made tough by habitual exposure
   • weather-beaten - tanned and coarsened from being outdoors
   same as: tough
2. Made hard or flexible or resilient especially by heat treatment (synset 301525661)
   "a sword of tempered steel"; "tempered glass"
   similar to:

   • curable - capable of being hardened by some additive or other agent
   • sunbaked - baked or hardened by exposure to sunlight; not burned
   same as: hardened, tempered, treated

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