fresh has 23 distinct synonyms spread across 9 of its 13 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 3 recorded opposites are stale, preserved, salty.
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.
recently made, produced, or harvested
“fresh bread”
imparting vitality and energy
“the bracing mountain air”
not canned or otherwise preserved
“fresh vegetables”
with restored energy
2 of the 13 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 fresh.
Synonyms, antonyms and the broader and narrower relations for fresh come from Princeton University’s WordNet. Full sources and licences.