Synonyms of 'ne plus ultra'
The new building is the ne plus ultra of theatrical design.
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The acme of something is its highest point of achievement or excellence.
His work is the acme of cinematic art.
You can use extremes to refer to situations or types of behaviour that have opposite qualities to each other, especially when each situation or type of behaviour has such a quality to the greatest degree possible.
a `middle way' between the extremes of success and failure
Thesaurus for ne plus ultra from the Collins English Thesaurus
the extreme or perfect point or state