temporary /ˈtemprəri/ or /ˈtempəreri/ (adj):

# ​lasting or intended to last or be used only for a short time; not permanent.

to hire temporary workers

They had to move into temporary accommodation.

Volunteers built temporary shelters for the survivors.

temporary relief from pain

a temporary fix/ measure/ solution

More than half the staff are temporary.

temporize /ˈtempəraɪz/ (v):

# (British English also temporise) [intransitive] (formal) to delay making a decision or giving a definite answer, in order to gain time.

-The speaker temporized in order to delay the vote.

-A student is most likely to temporize during a class discussion in order to avoid taking an exam.

-The verb "temporize" describes stalling in order to gain time in the hopes of avoiding or preventing something. Your class might temporize so your teacher won't have time to give the pop quiz you all think she's going to give.

pro tem /ˌprəʊ ˈtem/ (adv):

# (from Latin) ​for now, but not for a long time.

SYNONYM: temporarily;

A new manager will be appointed pro tem.

pro tem /ˌprəʊ ˈtem/ (adj):

# (from Latin) ​intended to exist or be used for only a short time.

SYNONYM temporary

A pro tem committee was formed from existing members.

OPPOSITE permanent

stopgap /ˈstɒpɡæp/ or /ˈstɑːpɡæp/ (n):

​# something that you use or do for a short time while you are looking for something better.

The arrangement was only intended as a stopgap.

a stopgap measure.

permanent

persistent /pəˈsɪstənt/ (adj):

# continuing for a long period of time, or repeated frequently, especially in a way that is annoying and cannot be stopped.

SYNONYM unrelenting

Persistent heavy rain held up work on the bridge for more than a week.

The most common symptom is a persistent cough.

I can’t take much more of this persistent criticism.

He resigned over persistent rumours of his affair with an actress.

Famine is a persistent problem in many parts of the world.