outgoing has 2 distinct synonyms spread across 1 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 incoming.
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.
leaving a place or a position
“an outgoing steamship”
retiring from a position or office
“the outgoing president”
at ease in talking to others
Synonyms, antonyms and the broader and narrower relations for outgoing come from Princeton University’s WordNet. Full sources and licences.