たしかに の訳語→ actual actually admit admittedly definitely despite distinctly do evidently exactly forsooth goddam indeed maybe namely obviously question realize really still strictly sure true very well yes
まぎれもない の訳語→ absolute certain certainly decidedly genuine indisputably indubitably inescapable sovereign truly undoubted undoubtedly unfailing unmistakable unquestionable
まぎれもなく の訳語→ absolutely only ultimately
間違いない の訳語→ adamant correctly fait accompli know must right surely