hardened (adj.)

• accustomed
• adapted
• adjusted
• annealed
• backed
• brazen
• callous
• calloused
• case-hardened
• cold
• coldhearted
• conditioned
• conscienceless
• crusted
• crusty
• crystallized
• experienced
• familiarized
• flinty
• fossilized
• granulated
• hard
• hard-boiled
• hardhearted
• heartless
• impenitent
• impervious
• indurate
• insensitive
• insolent
• inured
• naturalized
• obdurate
• orientated
• oriented
• ossified
• pachydermatous
• reinforced
• sclerotic
• seared
• seasoned
• set
• shameless
• solidified
• steely
• stony
• stonyhearted
• strengthened
• tempered
• thick-skinned
• toughened
• trained
• unblushing
• uncompassionate
• unemotional
• unfeeling
• unmelted
• unmerciful
• unnatural
• unrepentant
• unresponsive
• untouched
• vitrified
• wonted