1) Capriciousness 2) Flightiness 3) Irresponsibility 4) Irresponsibleness 5) Whimsey 6) Whimsicality 7) Whimsy 1) Chance 2) Flightiness 3) Whimsicality 
Arbitrariness is a term given to choices and actions subject to individual will, judgment or preference, based solely upon an individual`s opinion or discretion. Arbitrary decisions are not necessarily the same as random decisions. For example, during the 1973 oil crisis, Americans were allowed to purchase gasoline only on odd-numbered days if th....
• (n.) The quality of being arbitrary; despoticalness; tyranny.
Ar'bi·tra·ri·ness noun The quality of being arbitrary; despoticalness; tyranny. Bp. Hall. 
An essential notion in structural linguistics which denies any necessary relationship between linguistic signs and their referents, e.g. objects in the outside world.