IPA: /ʌnˈkʌmənli/
KK: /ʌnˈkʌmənli/
In a way that is not common or usual; to a degree that is rare or exceptional.
She uncommonly excels in mathematics compared to her peers.
Uncommonly → It is formed from "un-" (meaning not) and "common" (from Latin "communis", meaning shared or belonging to all) and the suffix "-ly" (meaning in a manner). The word "uncommonly" means in a manner that is not common or unusual.
Think of 'not' ('un-') being added to 'shared' ('common') to remember that 'uncommonly' describes something that is not usual or rare.