惺忪 (xīng sōng) is an adjective describing the drowsy, unfocused, slightly unfurled state of someone’s eyes just after waking up — often with eyelids heavy, gaze soft, and vision not yet fully sharp. The character 惺 (xīng) originally means ‘alert’ or ‘awake’, while 忪 (sōng) conveys a sense of slackness or looseness; together, they form a poetic oxymoron: not fully awake, yet no longer deeply asleep — the hazy transition between sleep and wakefulness.

This word is almost always used in literary or descriptive contexts, especially paired with verbs like 睁 (to open), 揉 (to rub), or 看 (to look). It frequently appears in phrases such as 惺忪的睡眼 (sleepy eyes), 惺忪地睁开眼 (to open one’s eyes sleepily), or 惺忪的神情 (a drowsy expression). It evokes gentleness and vulnerability, rarely used for animals or machines — exclusively for human states tied to morning routines or interrupted rest.