IPA: /ˌmæl.əˈdɔːr.əs.li/
KK: /mælˈoʊdərəsli/
In a way that produces an unpleasant or bad smell.
The garbage was left out and began to smell malodorously.
Malodorously → It is formed from "mal-" (meaning bad) and "odor" (from Latin "odor", meaning smell) and "-ously" (meaning in a manner). The word describes something that has a bad smell or is characterized by an unpleasant odor.
Think of 'mal-' meaning bad and 'odor' meaning smell — so when something is malodorously, it means it has a bad smell.