1. transitory Transient and transitory are both derived from the same original source (L. trans, over, and eo, go), denoting that which quickly passes or is passing away, but there is between them a fine s Synonyms: transient, brief, fleeting, fugitive, short, ephemeral, flitting, momentary, temporary, evanescent, flying, passing, transitory Antonyms: abiding, eternal, immortal, lasting, perpetual, undying, enduring, everlasting, imperishable, permanent, persistent, unfading