Definition
Fatuous means silly and pointless; foolish or inane, especially in an unconscious, complacent manner. It's like smiling vacantly without understanding what's going on. It suggests a lack of awareness or intelligence. Often, it implies a smug satisfaction with one's own foolishness. It's more than just being silly; it's being foolishly self-satisfied. Think of someone who is clueless but doesn't realize it.