operating-system (noun) operating system: computer software for basic operation
Sinonime: grim,
inexorable,
inflexible,
intractable, ironfisted,
mortal, pitiless, rancorous,
relentless, remorseless,
ruthless, unappeasable, unbending,
uncompromising, unflinching, unforgiving,
unrelenting,
unyielding,
vindictiveAntonime: kind,
merciful,
nice, placable