Imam al-awliya SayidinaHasan al-Basri (may Allah have mercy on him) said,

‘A person who is not afraid of hypocrisy (nifaq) (hidden in his character) is a hypocrite (munafiq) indeed.’

Hayat e muslih al-Umma ra, page 232

Hypocrisy: a pretense of having a virtuous character, moral or religious beliefs or principles, etc., that one does not really possess.