The first Shia Imam, Ali ibn Abitaleb (AS) said:

The hypocrite/insincere one has three signs: 1) When the hypocrite is alone; is bored and lethargic (lifeless). 2) When the hypocrite is with the people; is very active. 3) If the hypocrite is praised, will be more active, and if is criticized, will be less active [1].

[1] Al-Mahajjatul Baydha, Vol. 6, Page 144.

Source: en.shafaqna.com