incomparable

adj. cannot be compared, dissimilar; matchless, unequalled, unparalleled

adj. incomparable, unique, singular; matchless, unmatched; unparalleled, surpassing

adj. incomparable, matchless, unparalleled

(a.)
Not comparable; admitting of no comparison with others; unapproachably eminent; without a peer or equal; matchless; peerless; transcendent.
  

<mathematics> Two elements a, b of a set are incomparable under some relation (1995-09-21)