Answered
How do I conduct a negative search?
How do I filter my images using a keyword as a negative, i.e. "show me all the images that do NOT have the keyword "flower"?
How do I filter my images using a keyword as a negative, i.e. "show me all the images that do NOT have the keyword "flower"?
Don’t use the obvious search panel at the upper right of the interface…
Instead, one method is to use the Filter panel:

While another method is using the Edit menu > Find command:

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