1) Abrasive 2) Annealed 3) Caked 4) Chronic 5) Enured 6) Experienced 7) Inured 8) Sclerosed 9) Sclerotic 10) Set 11) Stale 12) Tempered 13) Toughened 14) Trained 1) Case-hardened 2) Converted to solid form 3) Emotionally hardened 4) Fully set 5) Got set 6) Got tough 7) Hard 8) Hard-boiled 9) Like dried cement or plaster 10) Like some criminals 11) Made callous 12) Made tougher 13) Protected against attack 14) Used of persons 
• (imp. & p. p.) of Harden • (a.) Made hard, or compact; made unfeeling or callous; made obstinate or obdurate; confirmed in error or vice.
Hard'ened (-'nd) adjective Made hard, or harder, or compact; made unfeeling or callous; made obstinate or obdurate; confirmed in error or vice. Syn. -- Impenetrable; hard; obdurate; callous; unfeeling; unsusceptible; insensible. See Obdurate .
[adj] - converted to solid form (as concrete)
adjective converted to solid form (as concrete)