1) General subject: after all (after all my trouble he has learnt nothing - несмотря на все мои старания, он ничего не выучил), contrary, despite (despite our efforts - несмотря на наши усилия), for all, however, in despite of (in his despite - ему назло), in spite of, in spite of of, in the face of, in the teeth of (smth.), nevertheless, notwithstanding, though, when, with (with all his gifts he failed - несмотря на все свои таланты, он не имел успеха), yet, through (Through all the hustle I was still able to focus and attempt to capture the perfect image.)
2) Colloquial: irregardless
3) Mathematics: regardless of (групповой предлог)
4) Sakhalin energy glossary: irrespective, nonetheless, regardless
5) Makarov: although
6) Archaic: withal
Универсальный русско-английский словарь. Академик.ру. 2011.