Former premier Najib Abdul Razak has dismissed Court of Appeal judge Abdul Karim Abdul Jalil's assessment that his actions in the SRC International case were not national service but a "national embarrassment".

Najib said if anything was a national embarrassment, it would be the forex scandal in the 1990s, which involved his archnemesis Dr Mahathir Mohamad.

"I am very disappointed with that (assessment)....