Vocabulary List 25

arbitrary
(adjective) random; not based on a plan or reason
The decision to cancel the program was completely arbitrary.

adversary
(noun) an enemy or opponent
She considered him an adversary within the company.

momentary
(adjective) lasting only for a short time
The pain of the injection was only momentary.

temporary
(adjective) not permanent
Volunteers built temporary shelters for the survivors.

voluntary
(adjective) done willingly and without being forced
Participation in the program is voluntary.

(adjective)
done willingly and without being paid
She does a lot of voluntary work for the Red Cross.