Unparalleled means greater than anything else of its kind. Unparalleled success, an unparalleled disaster, unparalleled in scale.
It works for good and bad alike, which is unusual for a superlative. The claim is that nothing stands beside it, and it is spelled with one r and two l's, which almost nobody gets right first time.
1adjectiveunparalleledGreater than anything else of its kind.
“The hotel offers unparalleled views of the mountains.”
unparalleled is a quality.
Also accepted in games: supreme
From un- + paralleled.
Etymology from Wiktionary, CC BY-SA