IPA: /ˈpærəˌmaʊntli/
KK: /ˈpærəˌmaʊntli/
In a way that is of the highest importance or significance.
The safety of the children is paramountly important to the school.
Paramountly → It is formed from "paramount" (from Old French *paramont*, meaning above or superior) and the suffix "-ly" (meaning in a manner of). The word "paramountly" means in a manner that is above all others or of the highest importance.
Think of something that is 'above' ('paramount') and done 'in a manner' ('-ly') that shows its utmost importance.
No commonly confused words.