The kanji 悪 primarily conveys the concept of "bad," "evil," "wrong," "wicked," or "harmful." It represents something that is morally or physically undesirable, causing harm, or going against what is considered good. It can also imply something that is of poor quality or faulty.

・On-yomi (音読み): アク (aku) ・Kun-yomi (訓読み): わる(い) (waru(i))

⚫︎悪者 (ak mono) Translation: Villain; bad person ⚫︎悪い天気 (warui tenki) Translation: Bad weather ⚫︎悪夢 (akumu) Translation: Nightmare

The kanji 悪 is a 形声文字 (keisei moji), a phono-semantic compound character. The left side is a component of "心" (kokoro - heart, mind) and the right side is "亞". The "亞" side is the phonetic component, indicating the sound, while the "心" side gives the meaning, showing the state of the mind. The original meaning was something like "a bad heart" or "a heart that is not correct", hence the association with evil or badness.