'arbitrary' definitions:

Definition of 'arbitrary'

From: WordNet
adjective
Based on or subject to individual discretion or preference or sometimes impulse or caprice; "an arbitrary decision"; "the arbitrary rule of a dictator"; "an arbitrary penalty"; "of arbitrary size and shape"; "an arbitrary choice"; "arbitrary division of the group into halves" [ant: nonarbitrary, unarbitrary]

Synonyms of 'arbitrary'

From: Moby Thesaurus