modern has 9 distinct synonyms spread across 4 of its 7 senses. Each sense below keeps its own list, because a synonym belongs to a meaning and not to a word: swapping one sense's substitute into another sense's sentence is how a thesaurus makes writing worse. Its 2 recorded opposites are nonmodern, old style.
Counts are distinct word forms across every sense. A synonym that appears under three senses is counted once here and shown three times below, under each sense it belongs to.
belonging to the modern era; since the Middle Ages
“modern art”
relating to a recently developed fashion or style
“their offices are in a modern skyscraper”
a typeface (based on an 18th century design by Gianbattista Bodoni) distinguished by regular shape and hairline serifs and heavy downstrokes
1 of the 7 recorded senses carries no synonym, antonym or related term, so it is not shown above. Every sense, with its definition and examples, is on the full entry for modern.
Synonyms, antonyms and the broader and narrower relations for modern come from Princeton University’s WordNet. Full sources and licences.