Search for checkbox...but only if null

I have a saved search for “has:checkbox” but is there a way I can include an operator or limiter that only returns empty checkboxes (not checked)?

! is:checked

Not following :frowning:

! is:completed is giving me things completed that have a date.

What I’m looking for is
has:checkbox AND not:completed except not isn’t an option.
Tried
has:checkbox NOT -:completed
Or
has:checkbox AND -:completed
which all give me some results but not
‘show me any item that has a blank checkbox’

minus sign = not, so:

has:checkbox -is:completed

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