Webster's Revised Unabridged Dictionary · 1913

Heady

Heady (hed"y) , adjective

[From Head.]

1.
Willful; rash; precipitate; hurried on by will or passion; ungovernable.
All the talent required is to be hot, to be heady, -- to be violent on one side or the other. — Sir W. Temple
2.
Apt to affect the head; intoxicating; strong.
The liquor is too heady. — Dryden
3.
Violent; impetuous.
A heady currance. — Shakespeare