Bad attitude - Iyagata

…Today, the term is used in theater in general and in movies, and is also called 'villain'. In the Genroku period, they were also called 'tekiyaku', 'villain', or 'iyagata', but later settled on 'katakiyaku'. As the types of 'kudariyaku' became more complex over time, various names were created. …

*Some of the terminology explanations that mention "bad" are listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

…今日では演劇一般，映画でも使われ，〈悪役〉ともいう。元禄時代には敵役（てきやく），悪人方，悪方（いやがた）ともいっていたが，のちに〈かたきやく〉という呼び方におちついた。時代が下り役の種類が複雑化するにつれて，いろいろな名称が生まれた。…

※「悪方」について言及している用語解説の一部を掲載しています。

出典｜株式会社平凡社世界大百科事典 第２版について | 情報