Jolterhead is an old-fashioned word that means someone who is foolish or scatterbrained. There are many synonyms for this word, including dolt, fool, nincompoop, dimwit, blockhead, and idiot. These words all describe someone who is lacking in intelligence or common sense. Another synonym for jolterhead is airhead, which is a term typically used to describe someone who is not very bright or is easily distracted. Other synonyms might include scatterbrain, dunce, imbecile, and moron. While these words may not be the most polite, they are useful for describing someone who is behaving in a foolish or silly manner.