new has 8 distinct synonyms spread across 6 of its 11 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 old, worn.
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.
not of long duration; having just (or relatively recently) come into being or been made or acquired or discovered
“a new law”
having no previous example or precedent or parallel
“a time of unexampled prosperity”
unaffected by use or exposure
“it looks like new”
(of crops) harvested at an early stage of development; before complete maturity
“new potatoes”
3 of the 11 recorded senses carry no synonym, antonym or related term, so they are not shown above. Every sense, with its definition and examples, is on the full entry for new.
Synonyms, antonyms and the broader and narrower relations for new come from Princeton University’s WordNet. Full sources and licences.