Comparative degree of the adjective 'fit'; denotes better physical condition or greater suitability.
Definitions
In better physical condition; healthier. After several weeks of cycling to work, he felt noticeably fitter.
More suitable or appropriate for a particular purpose. The committee decided that a smaller venue would be fitter for the intimate ceremony.
Synonyms
more athletic
more robust
in better shape
more suitable
more appropriate
better suited
more qualified
more capable