arbitrary
AR-bih-trair-eeadjMeaning based on whim or chance rather than on reason
Memory hook the king rolls the dice: no reason at all. King Victor rolls dice to decide each new rule: “Tuesday: no hats!” His rules are arbitrary.
The order of the names on the list was arbitrary; it meant nothing at all.
In context Students complained that the new dress code was arbitrary: no one could explain why green socks were allowed but blue ones were not.
Similar random, capricious, whimsical, unreasoned
Opposite reasoned, logical, rational
From Latin arbitrarius, “depending on a judge’s choice,” from arbiter (judge).