
1) Excellent 2) Incomparable 3) Matchless 4) Nonpareil 5) Peerless 6) Uncomparable 7) Unequalled 8) Unmatchable 9) Unrivaled
Found on
https://www.crosswordclues.com/clue/unrivalled

1) Incomparable 2) Matchless 3) Nonpareil 4) One and only 5) Peerless 6) Supreme; peerless 7) Uncomparable 8) Unmatchable 9) Unmatched 10) Unrivaled
Found on
https://www.crosswordclues.com/clue/unrivalled

HMS Unrivalled was a British Ursula Class submarine of 540 tons displacement launched in the early 1940s. She was armed with one small gun and six 21-inch torpedo tubes in the bow. She had a top speed of 11.25 knots surfaced and 10 knots submerged and carried a complement of 27.
Found on
http://www.probertencyclopaedia.com/browse/RU.HTM
No exact match found.