The word(s) "conjecture" appears 14 time(s) in 12 verse(s) in Quran in Muhammad Habib Shakir translation.

(1) And there are among them illiterates who know not the Book but only lies, and they do but conjecture.

(2) And their saying: Surely we have killed the Messiah, Isa son of Marium, the apostle of Allah; and they did not kill him nor did they crucify him, but it appeared to them so (like Isa) and most surely those who differ therein are only in a doubt about it; they have no knowledge respecting it, but only follow a conjecture, and they killed him not for sure.

(3) And if you obey most of those in the earth, they will lead you astray from Allah's way; they follow but conjecture and they only lie.

(4) Those who are polytheists will say: If Allah had pleased we would not have associated (aught with Him) nor our fathers, nor would we have forbidden (to ourselves) anything; even so did those before them reject until they tasted Our punishment. Say: Have you any knowledge with you so you should bring it forth to us? You only follow a conjecture and you only tell lies.

(5) And most of them do not follow (anything) but conjecture; surely conjecture will not avail aught against the truth; surely Allah is cognizant of what they do.

(6) Now, surely, whatever is in the heavens and whatever is in the earth is Allah's; and they do not (really) follow any associates, who call on others besides Allah; they do not follow (anything) but conjectures, and they only lie.

(7) (Some) say: (They are) three, the fourth of them being their dog; and (others) say: Five, the sixth of them being their dog, making conjectures at what is unknown; and (others yet) say: Seven, and the eighth of them is their dog. Say: My Lord best knows their number, none knows them but a few; therefore contend not in the matter of them but with an outward contention, and do not question concerning them any of them.

(8) And certainly the Shaitan found true his conjecture concerning them, so they follow him, except a party of the believers.

(9) And they disbelieved in it before, and they utter conjectures with regard to the unseen from a distant place.

(10) And they say: There is nothing but our life in this world; we live and die and nothing destroys us but time, and they have no knowledge of that; they only conjecture.