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ar·bi·trar·y  [ahr-bi-trer-ee]  Show IPA adjective, noun, plural ar·bi·trar·ies.
adjective
1.
subject to individual will or judgment without restriction; contingent solely upon one's discretion: an arbitrary decision.
2.
decided by a judge or arbiter rather than by a law or statute.
3.
having unlimited power; uncontrolled or unrestricted by law; despotic; tyrannical: an arbitrary government.
4.
capricious; unreasonable; unsupported: an arbitrary demand for payment.
5.
Mathematics . undetermined; not assigned a specific value: an arbitrary constant.
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ca·pri·cious  [kuh-prish-uhs, -pree-shuhs]  Show IPA
adjective
1.
subject to, led by, or indicative of a sudden, odd notion or unpredictable change; erratic: He's such a capricious boss I never know how he'll react.
2.
Obsolete . fanciful or witty. 

 from Dictionary.com