distinctive
individual
special
especial
idiosyncratic
quirky
eccentric
isolated
single
sole
lone
unrepeated
unrepeatable
solitary
exclusive
only
one and only
in a class by itself
rare
uncommon
unusual
peculiar
novel
strange
odd
sui generis
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a unique opportunity to see the spectacular Bolshoi Ballet
original and unique designs
a style of architecture that is unique to Portugal