Hollow adjective - Curved inward.
Usage example: there's a noticeably hollow spot in the mattress where he has been sleeping
Sunken is a synonym for hollow in empty topic. In some cases you can use "Sunken" instead an adjective "Hollow", when it comes to topics like convex. popular alternative
Sunken adjective - Curved inward.
Usage example: our convalescing guest's sunken cheeks soon filled out on a diet of my mother's cooking
Both words in one sentence
- The already gloomy Sunken Glades/Hollow Grove theme gets even grimmer on the path to Mount Horu.
Source: Dark Reprise
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Google Ngram Viewer shows how "hollow" and "sunken" have occurred on timeline