Here is a reportive dictionary definition of unique:
unique | yo͞oˈnēk |
adjective
being the only one of its kind; unlike anything else: the situation was unique in modern politics | original and unique designs.
• [predicative] (unique to) belonging or connected to (one particular person, group, or place): a style of architecture that is unique to Portugal.
• particularly remarkable, special, or unusual: a unique opportunity to see the spectacular Bolshoi Ballet.
I’ve emphasized the last definition to help show why qualifiers can apply to unique.
