Jeremiah 15:18 - Ellicott's Commentary On The Whole Bible

Wilt thou be altogether unto me as a liar...? — The words express a bitter sense of failure and disappointment. God had not prospered the mission of His servant as He had promised. The Hebrew, however, is not so startlingly bold as the English, and is satisfied by the rendering, wilt thou be unto me as a winter torrent, i.e., as in Job 6:15, like one which flows only in that season, and is dried up and parched in summer. See the play upon the word achzib (= a lie) in Micah 1:14.