Synonyms to toughen

acclimate, acclimatize, accommodate, accustom, adapt, adjust, break, break in, case harden, condition, confirm, domesticate, domesticize, establish, familiarize, fix, gentle, habituate, harden, housebreak, inure, naturalize, orient, orientate, season, tame, train, wont, beef up, accelerate, aggrandize, aggravate, augment, blow up, boost, brace, brace up, buttress, complicate, concentrate, condense, consolidate, deepen, double, enhance, enlarge, exacerbate, exaggerate, expand, extend, fortify, gird, heat up, heighten, hop up, hot up, intensify, invigorate, jazz up, key up, magnify, make complex, multiply, nerve, prop, ramify, redouble, refresh, reinforce, reinvigorate, restrengthen, sharpen, shore up, soup up, steel, step up, stiffen, strengthen, support, sustain, temper, triple, undergird, whet, abutment, advocate, affirm, afford support, alpenstock, arc-boutant, arm, athletic supporter, attest, authenticate, back, back up, backbone, backing, bandeau, bank, beam, bear, bear out, bear up, bearer, bolster, bolster up, bra, bracer, bracket, brass