IPA: /ˈʃʊrər/
KK: /ʃʊrər/
More certain or confident about something than before.
I am surer of my decision after thinking it over.
Surer → It is formed from "sure" (from Old French *sûr*, meaning certain or secure) and the comparative suffix "-er" (meaning more). The word "surer" means more certain or more secure than something else.
Think of 'sure' meaning certain, and when you add '-er', it indicates a greater degree of certainty. So, surer means more certain.