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arbitrary

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adjective American English pronunciation: arbitrary /ˈɑrbɪˌtreri/
  1. not based on any particular plan, or not done for any particular reason

    an arbitrary decision

    The selection of the 100 participants was completely arbitrary.

    1. a.
      used about actions that are considered to be unfair

      This is a country where arbitrary arrests are commonplace.

derived word

arbitrarily

 American English pronunciation: arbitrarily /ˈɑrbɪˌtrerəli/ American English pronunciation: arbitrarily /ˌɑrbɪˈtrerəli/  adverb

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