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"peerless" is also used as a crossword clue. If that's what you saw, the answer is often unrivalled (10 letters).
Definitions
eminent beyond or above comparison
Word origin
From Middle English pereles, perles; equivalent to peer + -less.
Used in a sentence
“Let's after him, / Whoſe care is gone before, to bid vs welcome: / It is a peerleſſe Kinſman.”
“Having now seen himself mistaken in supposing Elfride to be peerless, nothing on earth could make him believe she was not so very bad after all.”
“Telegram! Malachi Mulligan, The Ship, lower Abbey street. O, you peerless mummer! O, you priestified Kinchite!”
Source: Wiktionary, CC BY-SA 4.0
Used as a crossword answer1 curated clues
01“Beyond compare”8 letters
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