"toughened" in the verb sense
1. toughen
make tough or tougher
"This experience will toughen her"
"toughened" in the adjective sense
1. tough, toughened
physically toughened
"the tough bottoms of his feet"
2. tempered, treated, hardened, toughened
made hard or flexible or resilient especially by heat treatment
"a sword of tempered steel"
"tempered glass"
Source: WordNet® (An amazing lexical database of English)
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