Nifaq comes from the root nafiqaa, which is an escape hole that the jerboa (desert animal) builds. It is as if the person secretly escaped from Islam.
Major nifaq is for a person to pretend to be a Muslim while he is not.
“Verily, the hypocrites will be in the lowest depths (grade) of the Fire; no helper will you find for them.” (4:145)
Minor nifaq is the acts which typically hypocrites do. ‘To perform a permissible act while concealing its opposite.’
Break one’s trust
Break a promise
Use foul language in an argument
Show off good deeds
Not caring about striving in Allah’s path