悪
あく · aku · JLPT N3 · noun
evil
😈 悪 = 亜 (inferior, second-rate) + 心 (heart): a second-rate heart is evil
The top part 亜 means sub- or inferior, as in 亜流 (an imitation); under it sits 心, heart. A heart that falls below standard turns to vice. Sound hook: aku sounds like ack!, which is what you blurt out when you run into evil.