made or become hard or harder.

pitiless; unfeeling.

firmly established or unlikely to change; inveterate

a hardened criminal.

inured; toughened

a hardened trooper.

rigid; unyielding

a hardened attitude.

(of a missile base) equipped to launch missiles from underground silos.

(of a missile) capable of being launched from an underground silo.

adjective

compassionate , feeling , kind , nice , sympathetic

adjective

accustomed , benumbed , callous , case-hardened , coldhearted , contemptuous , cruel , disdainful , habituated , hard-as-nails , hard-bitten , hard-boiled * , hardhearted * , heartless , impenetrable , impious , inaccessible , indurated , inured , irreverent , obdurate , obtuse , prepared , resistant , seasoned , steeled , toughened , unashamed , unbending , uncaring , uncompassionate , unemotional , unrepenting , unsubmissive , cold-hearted , compassionless , hard , hard-boiled , hardhearted , stonyhearted , unfeeling , calloused , confirmed , depraved , graceless , impenitent , incorrigible , indurate , inexorable , inveterate , ossified , petrified , sclerosed , sclerotic , seared