Passing Synonyms
Words/phrases that have a similar definition to the word "passing" include...fly-by-night, departure, demise, death, transient, slapdash, dying, cursory, momentary, end, transitory, quick, leaving, disappearance, passing away, fleeting, casual, superficial, leave-taking, short-lived, ephemeral, surface, departing, desertion, temporary
Other words in thesaurus...