The word(s) "falsehood" appears 46 time(s) in 44 verse(s) in Quran in Mohsin Khan translation.

(31) The people of Nuh (Noah) and the Confederates after them denied (their Messengers) before these; and every (disbelieving) nation plotted against their Messenger to seize him, and disputed by means of falsehood to refute therewith the truth. So I seized them (with punishment), and how (terrible) was My punishment!

(32) See you not those who dispute about the Ayat (proofs, evidence, verses, lessons, signs, revelations, etc.) of Allah? How are they turning away [from the truth, (i.e. Islamic Monotheism to the falsehood (i.e. polytheism)]?

(33) And, indeed We have sent Messengers before you (O Muhammad صلى الله عليه وسلم): of some of them We have related to you their story. And of some We have not related to you their story, and it was not given to any Messenger that he should bring a sign except by the Leave of Allah. But, when comes the Commandment of Allah, the matter will be decided with truth, and the followers of falsehood will then be lost.

(34) falsehood cannot come to it from before it or behind it: (it is) sent down by the All-Wise, Worthy of all praise (Allah عز وجل).

(35) Or say they: "He has invented a lie against Allah?" If Allah willed, He could have sealed up your heart (so that you forget all that you know of the Qur'an). And Allah wipes out falsehood, and establishes the truth (Islam) by His Word (this Qur'an). Verily, He knows well what (secrets) are in the breasts (of mankind).

(36) And to Allah belongs the kingdom of the heavens and the earth. And on the Day that the Hour will be established - on that Day the followers of falsehood (polytheists, disbelievers, worshippers of false deities) shall lose (everything).

(37) That is because those who disbelieve follow falsehood, while those who believe follow the truth from their Lord. Thus does Allah set forth for mankind their parables.

(38) Who are playing in falsehood .

(39) O Prophet! When believing women come to you to give you the Bai'ah (pledge), that they will not associate anything in worship with Allah, that they will not steal, that they will not commit illegal sexual intercourse, that they will not kill their children, that they will not utter slander, intentionally forging falsehood (i.e. by making illegal children belonging to their husbands), and that they will not disobey you in Ma'ruf (Islamic Monotheism and all that which Islam ordains), then accept their Bai'ah (pledge), and ask Allah to forgive them. Verily, Allah is Oft-Forgiving, Most Merciful.

(40) 'And that the foolish among us [i.e. Iblis (Satan) or the polytheists amongst the jinn] used to utter against Allah that which was an enormity in falsehood.