toughened
adjective
1. physically toughened
- the tough bottoms of his feet
Similar word(s): rugged, experienced, experient, strong, callous, calloused, thickened, enured, hardened, inured, tough
2. made hard or flexible or resilient especially by heat treatment
Similar word(s): curable, sunbaked, hardened, tempered, treated
verb
1. simple past tense and past participle of toughen