TOUGHENED

tempered, treated, hardened, toughened

(adjective) made hard or flexible or resilient especially by heat treatment; “a sword of tempered steel”; “tempered glass”

tough, toughened

(adjective) physically toughened; “the tough bottoms of his feet”

Source: WordNet® 3.1

Verb

toughened

simple past tense and past participle of toughen

Source: Wiktionary

TOUGHEN

Tough"en, v. i.&t. [imp. & p. p. Toughened; p. pr. & vb. n. Toughening.]

Definition: To grow or make tough, or tougher.

Source: Webster’s Unabridged Dictionary 1913 Edition

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