arbitrary

adj. wanton, reckless; uncontrolled, unrestricted; unreasonable, unsupported

Arbitrary is a term given to choices and actions which are considered to be done not by means of any underlying principle or logic, but by whim or some decidedly illogical formula. For example, rearranging, for no reason, the letters of the alphabet so the letters appear in a staggered fashion (e.g. ac-bd-eg-fh). If there was a direct purpose in doing so, such as to make a better alphabet, then it would not be considered arbitrary.
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Adjective
1. 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"
(antonym) nonarbitrary, unarbitrary
(similar) absolute

(a.)
Exercised according to one's own will or caprice, and therefore conveying a notion of a tendency to abuse the possession of power.
  

(a.)
Despotic; absolute in power; bound by no law; harsh and unforbearing; tyrannical; as, an arbitrary prince or government.
  

(a.)
Depending on will or discretion; not governed by any fixed rules; as, an arbitrary decision; an arbitrary punishment.
  

1. despotic
انيائي , ظالم
2. capricious
بے قاعدہ , بے طور , بے ڈھنگ , بے وجہ
arbitrary government
خود مختار سلطنت , حکومت شخصي , سلطنت مطلق العنان