The character 惚 (as in 惚ける, bokeru ) is a phono-semantic compound: the radical 心 (heart/mind) indicates a mental state, while the phonetic component 忽 suggests suddenness or vagueness.
In its original language, boke carries several different meanings depending on how it is written or the context in which it's used: Kanji/Writing Usage Context 暈け / ボケ
This is the character who is "airheaded," says stupid things, or misinterprets reality. The Tsukkomi: