G4088
πικρία
bitterness
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)
The KJV translates G4088 in the following manner:
bitterness (8x)
Full Thayer's lexicon entry
πικρία — pikría
πικρία, πικρίας, ἡ (πικρός), bitterness: χολή πικρίας, equivalent to χολή πικρά (Winers Grammar, 34, 3 b.; Buttmann, § 132, 10), bitter gall, equivalent to extreme wickedness, Act 8:23; ῤίζα πικρίας (references as above), a bitter root, and so producing bitter fruit, Heb 12:15 (from Deu 29:18, the Alex. manuscript), cf. Bleek at the passage; metaphorically, bitterness, i. e. bitter hatred, Eph 4:31; of speech, Rom 3:14 after Psalm 9:28. (In various uses in the Sept. (Demosthenes, Aristotle), Theophrastus, Polybius, Plutarch, others.)
4 occurrences
Acts (1), Romans (1), Ephesians (1), Hebrews (1)