arbitrary

Definitions:

Determined solely by one's own judgment or good pleasure; exercised according to one's own discretion; subject to the will or control of no other; absolute; despotic; capricious.
- Nuttall's Standard dictionary of the English language. By Nuttall, P.Austin. Published 1914. (adjective) (adj.) (adjective)
Despotic; tyrannical; guided by will only.
- Etymological and pronouncing dictionary of the English language. By Stormonth, James, Phelp, P. H. Published 1874. (adjective) (adj.) (adjective)
Dictated by will; despotic.
- The Clarendon dictionary. By William Hand Browne, Samuel Stehman Haldeman. Published 1894. (adjective) (adj.) (adjective)
Depending on the will ( as of an arbiter): not bound by rules: despotic: absolute.
- The american dictionary of the english language. By Daniel Lyons. Published 1899. (adjective) (adj.) (adjective)
ARBITRARINESS.
- The american dictionary of the english language. By Daniel Lyons. Published 1899. (noun) (n.) (noun)
Not fixed by rule or law; capricious; unreasonable; despotic.
- The Winston Simplified Dictionary. By William Dodge Lewis, Edgar Arthur Singer. Published 1919. (adjective) (adj.) (adjective)
Arbitrarily.
- The Winston Simplified Dictionary. By William Dodge Lewis, Edgar Arthur Singer. Published 1919. (adverb) (adv.) (adverb)

Usage examples:

In certain other instances the rule may appear arbitrary and without a basis in reason.
- The Century Handbook of Writing by Garland Greever Easley S. Jones
He was not arbitrary or oppressive.
- Our Legal Heritage, 4th Ed. by S. A. Reilly
While generous and brave to an unusual degree, Perrot was extremely hot- tempered and of an arbitrary disposition.
- Shakespeare's Lost Years in London, 1586-1592 by Arthur Acheson