From match + -less, modelled after or partly continuing Middle English makeless, equivalent to make + -less.

matchless

1. Having no match; without equal.
   • 1819, Sir Walter Scott, chapter 8, in Ivanhoe:

     [T]he Prince was to declare the victor in the first day's tourney, who should receive as prize a warhorse of exquisite beauty and matchless strength.

   • 2002, Daniel Okrent, "[https://web.archive.org/web/20101022094146/http://www.time.com/time/magazine/article/0,9171,1003348,00.html Books: A Prince of a Pitcher]" (Review of: Sandy Koufax: A Lefty's Legacy), Time, 30 Sept.:

     It was not his matchless talent that exalted Koufax beyond his greatest contemporaries so much as it was his knowledge that character was not connected to talent.

2. Having no mate.

• (without equal) incomparable, nonpareil, peerless, unequaled, unmatched, unparalleled, unsurpassed
• (having no mate) single, unattached

• Portuguese: sem igual
• Russian: несравне́нный

From match + -less.

matchless (not comparable)

1. Without the use of matches for ignition.

   a matchless stove