Entry 1 sense Webster, 1913 Actionable /ăk'-shən-əb-əl/ · Ac·tion·a·ble · IPA /ˈæk.ʃə.nə.bəl/ 01 a. That may be the subject of an action or suit at law; as, to call a man a thief is actionable. 1. That may be the subject of an action or suit at law; as, to call a man a thief is actionable.