arbitrary
US /ˈɑːr.bə.trer.i/
UK /ˈɑːr.bə.trer.i/
1.
based on random choice or personal whim, rather than any reason or system
:
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The committee made an arbitrary decision without consulting anyone.
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His choice of colors seemed completely arbitrary.
2.
(of power or a ruling body) unrestrained and autocratic in the use of authority
:
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The dictator's rule was arbitrary and oppressive.
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Citizens feared the arbitrary arrests by the secret police.