unique vs unequalled

unique and unequalled both are adjectives.

Word	Noun	Adjective	Verb	Adverb
unique	No	Yes	No	No
unequalled	No	Yes	No	No

As adjectives, unique and unequalled are synonyms defined as:

Other synonyms of unique include alone, unequaled, unparalleled.

unique (adjective)	unequalled (adjective)
radically distinctive and without equal	radically distinctive and without equal
the single one of its kind
(followed by `to') applying exclusively to a given category or condition or locality
highly unusual or rare but not the single instance