Unrivalled
Part of speech: adjective
Definition: having no rival; better than any possible competitor
Unmatched
Part of speech: verb
Definition: To separate a matching pair.
Part of speech: adjective
Definition: not matched; oddpeerless; unrivalled; beyond comparison
Example sentence: When Joan Rivers walked through the curtain on 'The Tonight Show,' nobody in my house was allowed to utter a sound. Her gait was full of pep and purpose and her voice unmatched.