The word 无聊 is formed by directly combining two characters, each contributing a core concept to create a new, unified meaning. 无 (wú) means "without" or "to lack", establishing a state of absence. 聊 (liáo) in this context draws on its classical sense of "reliance" or "something to depend upon for engagement or meaning", akin to having a substantive conversation or occupation. Thus, together they paint a vivid picture of a mind or situation that is "without anything to engage with" or "lacking meaningful connection", perfectly capturing the essence of boredom and listlessness.