passing has 22 distinct synonyms spread across 10 of its 12 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 failing, running.
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.
(American football) a play that involves one player throwing the ball to a teammate
“the coach sent in a passing play on third and long”
the end of something
“the passing of winter”
going by something that is moving in order to get in front of it
“she drove but well but her reckless passing of every car on the road frightened me”
success in satisfying a test or requirement
“his future depended on his passing that test”
lasting a very short time
“the ephemeral joys of childhood”
1 of the 12 recorded senses carries no synonym, antonym or related term, so it is not shown above. Every sense, with its definition and examples, is on the full entry for passing.
Synonyms, antonyms and the broader and narrower relations for passing come from Princeton University’s WordNet. Full sources and licences.
hasty and without attention to detail; not thorough
“a casual (or cursory) inspection failed to reveal the house's structural flaws”