Unique
Part of speech: adjective
Definition: Being the only one of its kind; unequaled, unparalleled or unmatched. Of a feature, such that only one holder has it. (disputed) Of a rare quality. (disputed) Unusual.
Example sentence: Human beings, who are almost unique in having the ability to learn from the experience of others, are also remarkable for their apparent disinclination to do so.
Unparalleled
Part of speech: adjective
Definition: having no parallel; without equal; lacking anything similar or worthy of comparison.
Example sentence: I have nothing but unreserved praise for our armed forces, paramilitary and internal security forces. Their sacrifices to preserve the integrity and unity of our country present a saga of unparalleled courage and discipline.