Arbitrary
/ˈɑrbəˌtrɛri/
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Definition
(adj) Based on individual discretion or judgment; not based on any objective distinction, perhaps even made at random.
Sentence Examples
My mother prefers the arbitrary selection of the lottery machines over my lucky numbers.
Our decision to go to Portugal was quite arbitrary.
CEFR Practice Quiz
The colors for the new logo were chosen in an ____ way, with no rule.