The word(s) "liar" appears 53 time(s) in 49 verse(s) in Quran in Muhammad Habib Shakir translation.

(21) Then We sent Our apostles one after another; whenever there came to a people their apostle, they called him a liar, so We made some of them follow others and We made them stories; so away with a people who do not believe!

(22) Nay! We have brought to them the truth, and most surely they are liars.

(23) And the fifth (time) that the curse of Allah be on him if he is one of the liars.

(24) And it shall avert the chastisement from her if she testify four times, bearing Allah to witness that he is most surely one of the liars;

(25) Why did they not bring four witnesses of it? But as they have not brought witnesses they are liars before Allah.

(26) And you are naught but a mortal like ourselves, and we know you to be certainly of the liars.

(27) But they called him a liar, so the punishment of the day of covering overtook them; surely it was the punishment of a grievous day.

(28) They incline their ears, and most of them are liars.

(29) He said: We will see whether you have told the truth or whether you are of the liars:

(30) And Firon said: O chiefs! I do not know of any god for you besides myself; therefore kindle a fire for me, O Haman, for brick, then prepare for me a lofty building so that I may obtain knowledge of Musa's god, and most surely I think him to be one of the liars.