
Arbitrary
Lack of Reason
When something is arbitrary, it might seem unfair because it lacks a clear reason or system behind it.

Choosing participants by drawing names is arbitrary.
Personal Choice
Arbitrary decisions are often based on someone's own preferences, rather than any objective criteria.

The teacher's arbitrary favorite changed weekly.
Compare with
CapriciousErraticHaphazardInconsistentJustPredictRandomWhimsical
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