arbitrary
ar-bi-tra-ry
adjective
Exercising power without restraint; autocratic or despotic.
"An arbitrary ruler oppressed citizens."
adjective
Based on random choice or personal whim, not reason.
"The committee made an arbitrary decision."
Thesaurus
Synonyms: whimsical, discretional, capricious, absolute, discretionary, impulsive
Antonyms: nonarbitrary, unarbitrary