Webster's Revised Unabridged Dictionary · 1913

Histrionic

Histrionic , adjective

[Latin histrionicus: compare French histrionique. See Histrion.]

1.
Of or relating to the stage or a stageplayer; befitting a theatre; theatrical.
2.
Affectedly dramatic; insincerely emotional; -- sometimes used in a bad sense.
Tainted with false and histrionic feeling. — De Quincey

Also: Histrionical