1) Acting 2) Brief 3) Ephemeral 4) Evanescent 5) Fleeting 6) Fugacious 7) Guest 8) Impermanent 9) Improvised 10) Interim 11) Makeshift 12) Passing 13) Pro tempore 14) Stopgap 15) Temporal 16) Terminable 17) Transitory 18) Unstable 19) Visiting 1) Acting 2) Conditional 3) Ephemeral 4) Episodic 5) Evanescent 6) For a limited period only 7) Fugacious 8) Guest 9) Impermanent 10) Improvised 11) Interim 12) Intervening 13) Jury-rigged 14) Lasting only a short time 15) Makeshift 16) Marry poet, sadly short-term 17) Not here to stay 18) Not lasting 
• (a.) Lasting for a time only; existing or continuing for a limited time; not permanent; as, the patient has obtained temporary relief.
Tem'po·ra·ry adjective [ Latin temporarius , from tempus , temporis , time: confer French temporaire .] Lasting for a time only; existing or continuing for a limited time; not permanent; as, the patient has obtained temporary relief. « Temporary gover...
temporary 1. Lasting for or relating to a limited time; not permanent; transient; made to supply a passing need. 2. Someone who is hired to work in an office or other workplace for a limited time only. 3. Belonging to the present life or this world. Related 'time' units: aevum, evum; arch...
not lasting or permanent
not lasting, existing for a short time
not permanent - for a short time
not permanent; not lasting