depend on has 8 distinct synonyms spread across 3 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. WordNet records no antonym for it — antonymy is a relation between word forms rather than concepts, so it is deliberately sparse.
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.
put trust in with confidence
“she is someone you can really rely on when times get rough”
be dependent on, as for support or maintenance
“elderly parents often depend on their adult children”
Synonyms, antonyms and the broader and narrower relations for depend on come from Princeton University’s WordNet. Full sources and licences.