If you describe something as unequalled, you mean that it is greater, better, or more extreme than anything else of the same kind. This record figure was unequalled for 13 years.

What does Immitable mean?

: capable or worthy of being imitated or copied.

What is the definition unequal?

1a : not of the same measurement, quantity, or number as another. b : not like or not the same as another in degree, worth, or status. 2 : not uniform : variable, uneven. 3a : badly balanced or matched an unequal contest.