expression
no matter what; after all; in the end
Colloquial expression used to emphasize that something is true regardless of circumstances, or to give a reason that overrides objections. Similar to なんてったって.
See also: なんてったって
なんたって彼はプロだから、失敗するはずがない。
After all, he's a pro, so there's no way he'll fail.
なんたって、やるしかないんだ。
No matter what, we just have to do it.