No Brainiac is a term used to describe someone who is not particularly intelligent or knowledgeable. The crossword solutions for this term are DOPE and DODO, both of which have four letters. DOPE is an informal term meaning 'STUPID' or 'FOOLISH, ' while DODO is an extinct bird that was known for its lack of intelligence. Together, these two words provide a humorous way to describe someone who is not particularly bright.