histrionism
/ˈhɪstrɪənɪz(ə)m/noun
Theatrical practice, action, or style; pretence, play-acting; exaggerated or excessively theatrical words or behaviour; an instance of any of these.
Origin
Late 17th century; earliest use found in Thomas Browne (1605–1682), physician and author. From histrion or its etymon classical Latin histriōn-, histriō + -ism.