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KEY: Hard.
SYN: Firm, dense, solid, compact, unyielding, impenetrable, arduous, difficult, grievous, distressing, rigorous, oppressive, exacting, unfeeling, stubborn, harsh, forced, constrained, inexplicable, flinty, severe, {[cmel]?}, obdurate, hardened, callous.
ANT: Soft, fluid, liquid, elastic, brittle, penetrable, easy, mild, lenient, tender, ductile, uninvolved, simple, intelligible, perspicuous.
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KEY: Harden.
SYN: Inure, train, habituate, confirm, indurate, consolidate, compact.
ANT: Disinure, relax, enervate, debilitate, dishabituate, soften, melt, mollify, colliquate, vaporize.
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KEY: Hardened, [See FAVORABLE].