scatterbrain

noun scatterbrain

• airhead — If you describe someone, especially a young woman, as an airhead, you are critical of them because you think they are not at all clever and are interested only in unimportant things.
• birdbrain — a foolish or unintelligent person
• demoniac — of, like, or suggestive of a demon; demonic
• ditz — Slang. airhead2 .
• dork — Slang. a silly, out-of-touch person who tends to look odd or behave ridiculously around others; a social misfit: If you make me wear that, I’ll look like a total dork! Synonyms: jerk, schmo; nerd, geek.