From Longman Dictionary of Contemporary Englishsunken cheeks/eyes etcsunken cheeks/eyes etcIN/INSIDEcheeks or eyes that have fallen inwards, especially because of age or illness SYN hollow Her eyes looked dull and sunken. → sunken
Examples from the Corpus
sunken cheeks/eyes etc• The flesh had melted from her and she stared at the wall apathetically from sunken eyes.• The grey skin; the red-rimmed eyes; the sunken cheeks.• Black sunken eyes like dried figs.• No bulging rib cages, no collar bones out to here, no sunken eyes or bizarre hipbone bulges.• Fitzosbert's sunken cheeks were liberally rouged and this made his bulbous grey eyes seem even more fish-like. 