empty-headed
adjective
• unintelligent and foolish.
• "an empty-headed bimbo"
Similar:
stupid,
unintelligent,
idiotic,
foolish,
silly,
brainless,
half-witted,
witless,
vacuous,
vapid,
hare-brained,
feather-brained,
birdbrained,
pea-brained,
scatterbrained,
giddy,
skittish,
flighty,
frivolous,
thoughtless,
dumb,
dense,
dim,
airheaded,
brain-dead,
dippy,
dizzy,
dopey,
dozy,
screwy,
soft in the head,
slow on the uptake,
daft,
not the full shilling,
dappy,
batty,
dotty,
scatty,
ditzy,
dumb-ass,