- toughen
- Synonyms and related words:acclimate, acclimatize, anneal, be tough, beef up, brace, brace up, buttress, calcify, callous, case harden, confirm, cornify, develop, endure, firm, fortify, fossilize, gird, hang tough, harden, indurate, invigorate, lapidify, lithify, nerve, ossify, petrify, prop, refresh, reinforce, reinvigorate, restrengthen, season, shore up, steel, stiffen, strengthen, support, sustain, temper, undergird, vitrify
Moby Thesaurus. Grady Ward. 1996.