Synonyms for Scatterbrain:

n.

joker, dumb blond, numpty, maniac, airhead, lump, clown. dunce (noun)
dullard, fool, bonehead, moron, ignoramus, imbecile, blockhead, birdbrain, buffoon, lame-brain, nitwit, dimwit, simpleton, dolt.
ignoramus (noun)
bonehead, dullard, dunce, birdbrain, imbecile, dimwit, ignoramus, buffoon, fool, dummy, nitwit, dolt, simpleton, clod, moron, lame-brain, blockhead.
lunatic (noun)
maniac.
scatterbrain (noun)
forgetful person.
stupid person (noun)
dunce.

Other synonyms:

Other relevant words:
forgetful person, airhead, numpty, lump, maniac, joker, clown.

Usage examples for scatterbrain

  1. Darsie had muddled up the fact in her usual scatterbrain fashion, and by good right should have deplored her error. – A College Girl by Mrs. George de Horne Vaizey