The word(s) "plain" appears 82 time(s) in 82 verse(s) in Quran in Muhammad Pickthal translation.

(71) When Jesus came with clear proofs (of Allah's Sovereignty), he said: I have come unto you with wisdom, and to make plain some of that concerning which ye differ. So keep your duty to Allah, and obey me.

(72) By the Scripture that maketh plain

(73) How can there be remembrance for them, when a messenger making plain (the Truth) had already come unto them,

(74) And gave them plain commandments. And they differed not until after the knowledge came unto them, through rivalry among themselves. Lo! thy Lord will judge between them on the Day of Resurrection concerning that wherein they used to differ.

(75) Say: I am no new thing among the messengers (of Allah), nor know I what will be done with me or with you. I do but follow that which is inspired in me, and I am but a plain warner.

(76) Therefor flee unto Allah; lo! I am a plain warner unto you from him.

(77) And set not any other god along with Allah; lo! I am a plain warner unto you from Him.

(78) Allah hath heard the saying of her that disputeth with thee (Muhammad) concerning her husband, and complaineth unto Allah. And Allah heareth your colloquy. Lo! Allah is Hearer, Knower.

(79) Obey Allah and obey His messenger; but if ye turn away, then the duty of Our messenger is only to convey (the message) plainly.

(80) A messenger reciting unto you the revelations of Allah made plain, that He may bring forth those who believe and do good works from darkness unto light. And whosoever believeth in Allah and doeth right, He will bring him into Gardens underneath which rivers flow, therein to abide for ever. Allah hath made good provision for him.