How to I search for issues NOT flagged?

[Andreas]

This question is in reference to Atlassian Documentation: Flagging an Issue

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[Mike Drum]

If you're looking for something that's not flagged at all, just negating it won't do the trick. You will want to check for Flagged being 'empty':

Flagged is EMPTY

[Steffen Opel _Utoolity_]

To search for issues NOT flagged, you can simply negate the advanced search query, i.e. use either an explicit negation NOT

not (Flagged = Impediment)

or the shorthand notation for inequality

Flagged != Impediment

or, to be more future proof if more flag values get introduced, use NOT IN

Flagged not in (Impediment)

[Dirk Steinkopf p]

For me, all these 3 variant gave an empty result.

This one has helped me (as in the other answer from Mike Drum):

Flagged is EMPTY

[Liviu Andrei Torcatoru]

This did not work for me: Flagged is EMPTY

It will still display FLAGGED issues.