IPA: /ˌæn.tiˈmɒd.ɜrn/
KK: /æntiˈmɒdərn/
Opposed to the ideas, values, or practices of modern times.
The antimodern movement seeks to return to traditional ways of living.
A person who is against modern ideas, technology, or ways of living.
The antimodern often prefers traditional lifestyles over contemporary ones.
Antimodern is formed from "anti-" (meaning against) and "modern" (from Latin "modernus", meaning of the present time or recent). The word describes a stance or attitude that is against modernity or contemporary ideas.
Think of being 'against' ('anti-') the 'present time' ('modern') — that's why antimodern refers to opposing modern ideas.
No commonly confused words.