e‧go‧ma‧ni‧ac /ˌiːɡəʊˈmeɪniæk, ˌeɡ- $ -ɡoʊ-/ noun [countable]
someone who thinks that they are very important, and does not care whether they upset other people in order to get what they want

[TahlilGaran] Dictionary of Contemporary English ▲