Used to express that something is of low importance in comparison to other things. Losing a few coins was a bagatelle to the wealthy businessman.
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Often Subjective
What is a bagatelle to one person may be significant to another. Its importance can be subjective. A few hundred dollars may be a bagatelle to some, but a fortune to others.
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Slightest Effort
Can imply something was done or acquired with the slightest effort or concern. He completed the task with a bagatelle of effort.