IPA: /ˈfɛtɪdli/
KK: /ˈfɛtɪdli/
In a way that has a very unpleasant smell; foul or rotten.
The garbage was left out in the sun and began to smell fetidly.
Fetidly → It is formed from "fetid" (from Latin "fetidus", meaning stinking or foul) and the adverbial suffix "-ly" (meaning in a manner of). The word "fetidly" means in a manner that is foul-smelling or stinking.
Think of the word 'fetid' which means stinking, and remember that 'fetidly' describes something that is done in a stinking manner.