Impermanent (5)
'impermanent' is the definition.
(similar in meaning)
This is all the clue.
(Other definitions for transient that I've seen before include "Passing, short-lived" , "Lasting little time" , "fugitive" , "Here today, gone tomorrow" , "Lasting a short time" .)
'impermanent' is the definition.
(synonyms)
This is all the clue.
(Other definitions for temporary that I've seen before include "short-term" , "For a short period only" , "Not permanent or lasting" , "Not for long" , "Impermanent" .)
(Another definition for adhoc that I've seen is " for this special purpose".)