Adam Clarke on Job 23:2

Even to-day is my complaint bitter - Job goes on to maintain his own innocence, and shows that he has derived neither conviction nor consolation from the discourses of his friends. He grants that his complaint is bitter; but states that, loud as it may be, the affliction which he endures is heavier than his complaints are loud. Mr. Good translates: "And still is my complaint rebellion?" Do ye construe my lamentations over my unparalleled sufferings as rebellion against God? This, in fact, they had done from the beginning: and the original will justify the version of Mr. Good; for מרי meri, which we translate bitter, may be derived from מרה marah, "he rebelled."