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arbitrary

Something that's arbitrary seems like it's chosen at random instead of following a consistent rule. Team members would dislike their coach using a totally arbitrary method to pick starting players.

Even though arbitrary comes from a word meaning "judge" (arbiter), that doesn't mean judges are always fair. Calling a decision-maker arbitrary is usually a negative thing, suggesting the person is making rules based on whim rather than justice. A coach who selects starting players arbitrarily isn't strictly applying a rule; he could just be picking names out of a hat.

Definitions of arbitrary
  1. 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”
    Synonyms:
    absolute
    not limited by law
    capricious, impulsive, whimsical
    determined by chance or impulse or whim rather than by necessity or reason
    discretional, discretionary
    having or using the ability to act or decide according to your own discretion or judgment
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    Antonyms:
    nonarbitrary, unarbitrary
    not subject to individual determination
    prescribed
    set down as a rule or guide
    show more antonyms...
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