The Collaborative International Dictionary of English v.0.48:

Incomparable \In*com"pa*ra*ble\, a. [L. incomparabilis: cf. F.
   incomparable. See In- not, and Comparable.]
   Not comparable; admitting of no comparison with others;
   unapproachably eminent; without a peer or equal; matchless;
   peerless; transcendent.
   [1913 Webster]

         A merchant of incomparable wealth.       --Shak.
   [1913 Webster]

         A new hypothesis . . . which hath the incomparable Sir
         Isaac Newton for a patron.               --Bp.
                                                  Warburton.
   -- In*com"pa*ra*ble*ness, n. -- In*com"pa*ra*bly, adv.
   [1913 Webster]

         Delights incomparably all those corporeal things. --Bp.
                                                  Wilkins.
   [1913 Webster]

WordNet (r) 3.0 (2006):

incomparable
    adj 1: such that comparison is impossible; unsuitable for
           comparison or lacking features that can be compared; "an
           incomparable week of rest and pleasure"; "the computer
           proceeds with its incomparable logic and efficiency";
           "this report is incomparable with the earlier ones
           because of different breakdowns of the data" [syn:
           incomparable, uncomparable] [ant: comparable]

The Free On-line Dictionary of Computing (19 January 2023):

incomparable

    Two elements a, b of a set are incomparable
   under some relation <= if neither a <= b, nor b <= a.

   (1995-09-21)