Verses with the word plain in the New Testament (2 verses):

Mark 7:35
And straightway his ears were opened, and the string of his tongue was loosed, and he spake plain.

Luke 6:17
And he came down with them, and stood in the plain, and the company of his disciples, and a great multitude of people out of all Judaea and Jerusalem, and from the sea coast of Tyre and Sidon, which came to hear him, and to be healed of their diseases;