steelest (adjective) iron: hard, tough; inflexible
Detalii: ferrum is the Latin name for iron, from which its chemical symbol Fe is derived; iron exists in various states of impurity and it is processed to produce cast iron, wrought iron, etc. and steel (steel is iron to which carbon and other things have been added)
Sinonime: adamant, adamantine,
cruel,
dense, ferric, ferrous,
firm,
heavy, immovable,
implacable,
indomitable,
inexorable, insensible,
obdurate,
relentless,
rigid,
robust,
steel, steely,
strong,
stubborn,
thick, unbending,
unyieldingAntonime: flexible,
soft,
weak