empty-headed, stupid; foolish and noisy;
talkative, chattering, giddy, flighty, hare-brained ...1647
from rattle (n. a rapid succession of short, sharp, percussive sounds) + -headed
FIRST DOCUMENTED USE
1647 - see EXAMPLE below
"...The Rattle-headed Ladyes being Assembled at Kates in the Covent-Garden, and having spent some time in choosing of their Speaker, it having been objected against the Lady Duches that shee had used beating up of quatters..."
From: The Parliament of Ladies. Or Divers Remarkable Passages of Ladies in Spring-Garden; in Parliament Assembled
- Henry Neville