Definitions

1. adjective

strongly unpleasant or disagreeable; foul or loathsome

“The foul smell was foulsome, making it hard to breathe.”

2. noun

a foul or disagreeable smell

“The stench was a foulsome mixture of rotting garbage and sewage.”

3. noun

an unpleasant or disagreeable quality

“The foulsome atmosphere of the abandoned factory made it hard to work.”