Filter customers that are NOT tagged with x

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I have english and french speaking customers.
I am segmenting the subscribers to target my email marketing campaign.
All my english speaking customers are tagged with 'en' so they are quite easy to segment.
How could we filter the french speaking customers(that have no particular tags attached) in another segment?
Is there a logic we can use in the search bar that will exclude all customers that have a specific tag attached to them?
(in this case 'en')

Thank you!