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Triviality
Not Important
Use 'triviality' to express that something is so small or unimportant it's almost not worth mentioning. 
Dismissive Tone
When calling something a 'triviality', it can sound dismissive, as if the matter is too small to care about. 
Undermining Issues
Labeling a concern as a 'triviality' might offend someone if they consider it important. 