depreciate has 5 distinct synonyms spread across 2 of its 3 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 one recorded opposite is appreciate.
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.
lower the value of something
“The Fed depreciated the dollar once again”
Synonyms, antonyms and the broader and narrower relations for depreciate come from Princeton University’s WordNet. Full sources and licences.
lose in value
“The dollar depreciated again”