Meaning: 悪性n. (Hira=あくせい) malignance, tendency to cause death, deadliness (Pathology)n. (Hira=あくしょう) evil nature, harmful character, evil personality; natural tendency of a person to do evil, negative instinct; licentiousness, lack of sexual restraint, lewdnessadj. (Hira=あくしょうな) evil-minded, having an evil disposition, malignant, wicked