They say still. Figure of speech Polyptoton. Hebrew. saying they say. keep on saying.
imagination. stubbornness.
Related Commentaries of Jeremiah 23:17
Jeremiah 23:17
17 They say still unto them that despise me, The LORD hath said, Ye shall have peace; and they say unto every one that walketh after the imaginationd of his own heart, No evil shall come upon you.