Verb


1. toughen, strengthen

usage: make tough or tougher; "This experience will toughen her"

Adjective


1. tough (vs. tender), toughened, calloused, callous, thickened, enured, inured, hardened, weather-beaten, experienced#1, experient, rugged, strong

usage: physically toughened; "the tough bottoms of his feet"

2. tempered (vs. untempered), treated, hardened, toughened, curable, sunbaked

usage: made hard or flexible or resilient especially by heat treatment; "a sword of tempered steel"; "tempered glass"

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