As adjectives the difference between unparalleled and unrivalled
is that unparalleled is having no parallel; without equal; lacking anything similar or worthy of comparison while unrivalled is having no rival; better than any possible competitor.
unparalleled
English
Alternative forms
*unparallelled (UK )
Adjective
(
en adjective)
Having no parallel; without equal; lacking anything similar or worthy of comparison.
:The candidate experienced unparalleled support in the last election.
unrivalled
English
Adjective
(-)
having no rival; better than any possible competitor