The word(s) "plain" appears 101 time(s) in 98 verse(s) in Quran in Mohsin Khan translation.

(51) And say to My slaves (i.e. the true believers of Islamic Monotheism) that they should (only) say those words that are the best. (Because) Shaitan (Satan) verily, sows a state of conflict and disagreements among them. Surely, Shaitan (Satan) is to man a plain enemy.

(52) And indeed We have fully explained to mankind, in this Qur'an, every kind of similitude, but most of mankind refuse (the truth and accept nothing) but disbelief.

(53) And (remember) the Day We shall cause the mountains to pass away (like clouds of dust), and you will see the earth as a levelled plain, and we shall gather them all together so as to leave not one of them behind.

(54) And on that Day We shall present Hell to the disbelievers, plain to view -

(55) How clearly will they (polytheists and disbelievers in the Oneness of Allah) see and hear the Day when they will appear before Us! But the Zalimun (polytheists and wrong-doers) today are in plain error.

(56) "Then He shall leave them as a level smooth plain.

(57) And thus We have sent it down as a Qur'an in Arabic, and have explained therein in detail the warnings, in order that they may fear Allah, or that it may cause them to have a lesson from it (or to have the honour for believing and acting on its teachings).

(58) Verily, in this (the Qur'an) there is a plain Message for people who worship Allah (i.e. the true, real believers of Islamic Monotheism who act practically on the Qur'an and the Sunnah - legal ways of the Prophet صلى الله عليه وسلم).

(59) Say (O Muhammad صلى الله عليه وسلم): "O mankind! I am (sent) to you only as a plain warner."

(60) And Allah makes the Ayat (proofs, evidence, verses, lessons, signs, revelations, etc.) plain to you, and Allah is All-Knowing, All-Wise.