πικρία, -ας, ἡ (πικρός), [in LXX chiefly for מַר and cognate forms;]
bitterness; (a) of taste (Arist, Jer.15:17, al.); (b) metaphorically, of temper, character, etc: Rom.3:14 (LXX), Eph.4:31; ῥίζα πικρίας, Heb.12:15; χολὴ π, a malignant disposition, Act.8:23. (
AS)