- 1in a way that produces a wide piece or deep layer of something thickly sliced bread Apply the paint thickly in even strokes.
- 2thickly wooded, populated, etc. having a lot of trees, people, etc. close together
- 3in a deep voice that is not as clear as normal, especially because of illness or emotion “Just leave me alone,” he said thickly.
Check pronunciation: thickly