steeled (?.)

• Philistine
• backed
• calcified
• callous
• calloused
• case-hardened
• crusted
• crusty
• crystallized
• flinty
• fossilized
• granulated
• hard
• hardened
• hardhearted
• hornified
• impervious
• incrusted
• indurate
• indurated
• insensitive
• inured
• lapidified
• ossified
• pachydermatous
• petrified
• proof against
• reinforced
• rigidified
• sclerotic
• set
• solidified
• steeled against
• steely
• stiffened
• stony
• strengthened
• thick-skinned
• toughened
• vitrified