From athaq in the sense of license; impudent -- arrogancy, grievous (hard) things, stiff.
see HEBREW athaq
H6277. athaq
עָתָק adjective forward, arrogant (of speech) (Thes free (see Arabic), unrestrained); — 1 Samuel 2:3; Psalm 31:19; 94:4; so also 75:6 (compare צַוָּאר).