The word(s) "lost" appears 36 time(s) in 36 verse(s) in Quran in Abdullah Yusuf Ali translation.

(1) These are they who have bartered Guidance for error: But their traffic is profitless, and they have lost true direction,

(2) But ye turned back thereafter: Had it not been for the Grace and Mercy of Allah to you, ye had surely been among the lost.

(3) If anyone desires a religion other than Islam (submission to Allah), never will it be accepted of him; and in the Hereafter He will be in the ranks of those who have lost (All spiritual good).

(4) How many of the prophets fought (in Allah's way), and with them (fought) Large bands of godly men? but they never lost heart if they met with disaster in Allah's way, nor did they weaken (in will) nor give in. And Allah Loves those who are firm and steadfast.

(5) They glory in the Grace and the bounty from Allah, and in the fact that Allah suffereth not the reward of the Faithful to be lost (in the least).

(6) And their Lord hath accepted of them, and answered them: "Never will I suffer to be lost the work of any of you, be he male or female: Ye are members, one of another: Those who have left their homes, or been driven out therefrom, or suffered harm in My Cause, or fought or been slain,- verily, I will blot out from them their iniquities, and admit them into Gardens with rivers flowing beneath;- A reward from the presence of Allah, and from His presence is the best of rewards."

(7) This day are (all) things good and pure made lawful unto you. The food of the People of the Book is lawful unto you and yours is lawful unto them. (Lawful unto you in marriage) are (not only) chaste women who are believers, but chaste women among the People of the Book, revealed before your time,- when ye give them their due dowers, and desire chastity, not lewdness, nor secret intrigues if any one rejects faith, fruitless is his work, and in the Hereafter he will be in the ranks of those who have lost (all spiritual good).

(8) The (selfish) soul of the other led him to the murder of his brother: he murdered him, and became (himself) one of the lost ones.

(9) Some people before you did ask such questions, and on that account lost their faith.

(10) Say: "To whom belongeth all that is in the heavens and on earth?" Say: "To Allah. He hath inscribed for Himself (the rule of) Mercy. That He will gather you together for the Day of Judgment, there is no doubt whatever. It is they who have lost their own souls, that will not believe.