IPA: /dɪˈtɛstər/
KK: /dɪˈtɛstər/
A person who strongly dislikes or hates something.
She is a detester of loud music and prefers quiet environments.
Detester → It is formed from "de-" (meaning down or away) and "testari" (meaning to witness or testify). The word originally conveys the idea of witnessing something negatively or rejecting it, hence to detest or strongly dislike something.
Think of 'witnessing' ('testari') something 'down' or 'away' ('de-') — that's why detester means to strongly dislike or reject something.