This is a single kanji with an い on the end, meaning you know it's probably an adjective. What's the adjective form of stinking? It's also stinking (or stinky).
The reading you learned with the kanji can be used here, too.
The flooded area smelled really stinky.
Excuse my garlic breath. It smells terrible, right? I just ate ramen.
My husband's morning breath was too stinky to bear, so I decided to divorce him.