The word(s) "not" appears 1997 time(s) in 1622 verse(s) in Quran in Muhammad Pickthal translation.

(361) We confound their hearts and their eyes. As they believed not therein at the first, We let them wander blindly on in their contumacy.

(362) And though We should send down the angels unto them, and the dead should speak unto them, and We should gather against them all things in array, they would not believe unless Allah so willed. Howbeit, most of them are ignorant.

(363) Thus have We appointed unto every prophet an adversary - devils of humankind and jinn who inspire in one another plausible discourse through guile. If thy Lord willed, they would not do so; so leave them alone with their devising;

(364) That the hearts of those who believe not in the Hereafter may incline thereto, and that they may take pleasure therein, and that they may earn what they are earning.

(365) Shall I seek other than Allah for judge, when He it is Who hath revealed unto you (this) Scripture, fully explained? Those unto whom We gave the Scripture (aforetime) know that it is revealed from thy Lord in truth. So be not thou (O Muhammad) of the waverers.

(366) How should ye not eat of that over which the name of Allah hath been mentioned, when He hath explained unto you that which is forbidden unto you unless ye are compelled thereto. But lo! many are led astray by their own lusts through ignorance. Lo! thy Lord, He is Best Aware of the transgressors.

(367) And eat not of that whereon Allah's name hath not been mentioned, for lo! it is abomination. Lo! the devils do inspire their minions to dispute with you. But if ye obey them, ye will be in truth idolaters.

(368) Is he who was dead and We have raised him unto life, and set for him a light wherein he walketh among men, as him whose similitude is in utter darkness whence he cannot emerge? Thus is their conduct made fairseeming for the disbelievers.

(369) And thus have We made in every city great ones of its wicked ones, that they should plot therein. They do but plot against themselves, though they perceive not.

(370) And when a token cometh unto them, they say: We will not believe till we are given that which Allah's messengers are given. Allah knoweth best with whom to place His message. Humiliation from Allah and heavy punishment will smite the guilty for their scheming.