From The Collaborative International Dictionary of English v.0.44 [gcide]:
Toughen \Tough"en\, verb (used without an object) & t. [imp. & p. p. {Toughened}; p. pr. & vb. n. {Toughening}.] To grow or make tough, or tougher.
From WordNet (r) 2.0 [wn]:
adjective
1: physically toughened; "the tough bottoms of his feet" [syn: {tough}] [ant: {tender}]
2: made hard or flexible or resilient especially by heat treatment; "a sword of tempered steel"; "tempered glass" [syn: {tempered}, {treated}, {hardened}] [ant: {untempered}]
From Moby Thesaurus II by Grady Ward, 1.0 [moby-thes]:
29 Moby Thesaurus words for "toughened": annealed, backed, calcified, callous, calloused, case-hardened, crusted, crusty, crystallized, fossilized, granulated, hardened, hornified, incrusted, indurate, indurated, lapidified, ossified, petrified, reinforced, rigidified, sclerotic, set, solidified, steeled, stiffened, strengthened, tempered, vitrified
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