histrionic

Concise Oxford English Dictionary © 2008 Oxford University Press:
histrionic /ˌhɪstrɪˈɒnɪk/

▶adjective

• 1 overly theatrical or melodramatic.

• 2 formal of or concerning actors or acting.

▶noun (histrionics) exaggerated dramatic behaviour designed to attract attention.

– derivatives
histrionically adverb.

– origin C17: from late L. histrionicus, from L. histrio(n-) ‘actor’.