arbitrary
adjective
subject to individual will or judgment without restriction; contingent solely upon one's discretion.
The grammatical form denoting more than one person, place, thing, or idea.
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Some contained codes, devised by Anson Stager, general manager of U.S. military telegraphs, that inserted decoy words or arbitraries into messages that were unscrambled with cipher charts.
From Los Angeles Times ● Aug. 19, 2016