IPA: /səˈpruːmli/
KK: /səˈpruːmli/
To the greatest or highest degree possible.
She was supremely confident in her abilities during the presentation.
Supremely → It is formed from "supreme" (from Latin "supremus", meaning highest or utmost) and "-ly" (a suffix used to form adverbs). The word "supremely" means in the highest degree or to the utmost extent.
Think of 'supreme' meaning the highest level, and remember that 'supremely' describes something done to the utmost degree.