Transeunt is an adjective that means passing or fleeting. Synonyms for transeunt include transient, ephemeral, momentary, passing, fleeting, evanescent, short-term, brief, temporary, and fugitive. These words all refer to things that are short-lived or passing, whether they be emotions, experiences, or physical things. Transeunt is a more uncommon word and can often be replaced with these synonyms to make writing clearer and more accessible. It is always good to have a broad vocabulary, allowing one to communicate more precisely and elegantly.