unusualThat's an unusual name - where does it come from?
uncommonIt's not uncommon(= it is common)for people to become ill when they travel.
rareThis is a rare opportunity to visit the building.
unconventionalI had a very unconventional childhood.
uniqueThis is your chance to own a unique piece of jewellery.
exoticThe room was decorated with exotic flowers.
quirkyHe has a very quirky sense of humour.
one of a kindHe was truly one of a kind, and will be missed.