无坚不摧

no stronghold one cannot overcome (idiom); to conquer every obstacle / nothing one can't do / to carry everything before one

not to have / no / none / not / to lack / un- / -less

strong / solid / firm / unyielding / resolute

no; not so / (bound form) not; un-

to break / to destroy / to devastate / to ravage / to repress