scatterbrained[adjective]Synonyms: giddy, bird-witted, dizzy, empty-headed, featherbrained, flighty, frivolous, harebrained, rattlebrained, silly
[TahlilGaran] English Synonym Dictionary ▲
scat‧ter‧brained /ˈskætəbreɪnd $ -tər-/
adjective informal not thinking in a practical way, so that you cannot do things or you forget or lose things
—scatterbrain noun [countable] [TahlilGaran] Dictionary of Contemporary English ▲