"Uncowed" means to show courage/boldness, not fearful or repressed.
Un- is a prefix/root word meaning "not."
So "cowed" could be considered one. (Cowed's definition is "to cause someone to submit to one's wishes by using intimation."
Synonyms for cowed and antonyms for uncowed include:
bullied, intimidated, and timid.
Hope this helps,
-Tiara