rattlebrained

Mane (Îngilîzî)

Foolish

Hevwate

scatterbrained

scatty

rattlepated

anserine

Boeotian

cockamamie

dense

dim-witted

dizzy

💫

dopey

dopy

dull

feebleminded

fond

foolish

frivolous

giddy

half-baked

half-witted

headless

hen-witted

inane

insensate

meshuga

sappy

slow-witted

sottish

stupid

unwise

cockamamy

goony

gooselike

nutty as a fruitcake

insipient

sawney

soft-witted

dunderheaded

clottish

lamebrained

oxlike

duncelike

chowderheaded

boobish

twp

lunkish

wisdomless

twatty

melon-headed

apish

balmy

Werger

dumm

närrisch

töricht

narrenhaft

insensé

sot

baggiano

burattinesco

ciucco

dissennato

insensato

insulso

scempio

scimunito

albern

Etîmolojî (Îngilîzî)

From rattle + brained.