inane
Silly and pointless, without any real meaning or value.
Inane means silly and pointless in a way that lacks any real substance or meaning. When something is inane, it's empty and vapid, offering nothing of value while also being foolish.
An inane comment in class might be someone randomly shouting “purple elephants!” during a serious discussion about history. An inane TV show might have characters giggling at nothing for half an hour without telling an actual story or making a real joke. The word suggests a special kind of emptiness: hollow and meaningless rather than simply bad or stupid.
You might hear adults describe inane chatter at a boring party where people talk endlessly about nothing important, or inane questions that waste everyone's time because they miss the point entirely. If a friend keeps making inane remarks during a movie, they're saying things so pointless that they distract from what's actually happening on screen.
That emptiness is the key: inane things don't just fail. They offer nothing at all to think about.