The word(s) "liar" appears 43 time(s) in 42 verse(s) in Quran in Mohsin Khan translation.

(21) Who gives ear (to the devils and they pour what they may have heard of the Unseen from the angels), and most of them are liars.

(22) And they belied them (those Ayat) wrongfully and arrogantly, though their ownselves were convinced thereof [i.e. those (Ayat ) are from Allah, and Musa (Moses) is the Messenger of Allah in truth, but they disliked to obey Musa (Moses), and hated to believe in his Message of Monotheism]. So see what was the end of the Mufsidun (disbelievers, disobedient to Allah, evil-doers and liars.).

(23) [Sulaiman (Solomon)] said: "We shall see whether you speak the truth or you are (one) of the liars.

(24) Fir'aun (Pharaoh) said: "O chiefs! I know not that you have an ilah (a god) other than me. So kindle for me (a fire), O Haman, to bake (bricks out of) clay, and set up for me a Sarh (a lofty tower, or palace) in order that I may look at (or look for) the Ilah (God) of Musa (Moses); and verily, I think that he [Musa (Moses)] is one of the liars."

(25) And We indeed tested those who were before them. And Allah will certainly make (it) known (the truth of) those who are true, and will certainly make (it) known (the falsehood of) those who are liars, (although Allah knows all that before putting them to test).

(26) And those who disbelieve say to those who believe: "Follow our way and we will verily bear your sins." Never will they bear anything of their sins. Surely, they are liars.

(27) "Allah has begotten [offspring - the angels being the daughters of Allah)?" And, verily, they are liars!

(28) And they (Arab pagans) wonder that a warner (Prophet Muhammad صلى الله عليه وسلم) has come to them from among themselves. And the disbelievers say: "This (Prophet Muhammad صلى الله عليه وسلم) is a sorcerer, a liar.

(29) Surely the religion (i.e. the worship and the obedience) is for Allah only. And those who take Auliya' (protectors, helpers, lords, gods) besides Him (say): "We worship them only that they may bring us near to Allah." Verily Allah will judge between them concerning that wherein they differ. Truly, Allah guides not him who is a liar, and a disbeliever.

(30) To Fir'aun (Pharaoh), Haman and Qarun (Korah), but they called (him): "A sorcerer, a liar!"