説明書

Flat, and by extension calm. 平和 is peace; 平気 is being unbothered by something.

Sound, including music. 音楽 is music; 発音 is pronunciation.

Clear and cheerful, of a voice or a person. 明朗 is bright and open; 朗読 is reading aloud.

To look down on. 軽蔑 is contempt — the word is not softened in Japanese either.