IPA: //mɪˈzɒɡəmɪst//
KK: /mɪˈzɒgəmɪst/
A person who dislikes or has a strong aversion to marriage.
He is known as a misogamist because he believes that marriage complicates life.
Misogamist is formed from "miso-" (from Greek "misos", meaning hatred) and "gamos" (from Greek "gamos", meaning marriage). The word refers to someone who has a hatred or aversion to marriage.
Think of 'hatred' ('miso-') towards 'marriage' ('gamos') — that's why a misogamist is someone who dislikes marriage.