Dewy means looking softly moist and fresh. A dewy complexion, dewy grass, dewy-eyed.
In cosmetics it names a finish — dewy against matte — and it is achieved by reflecting light rather than by actual moisture. Dewy-eyed means naively sentimental. Note dew, which forms when a surface cools below the temperature at which air gives up its water, usually just before dawn.
1adjectivedewyLooking softly moist and fresh.
“Her skin looked dewy and fresh after the facial.”
dewy is a quality of freshness.
Old English deawig is dew plus -y. Dew is Germanic and very old.
Proto-West Germanic
*dauwag
Old English
dēawiġ
Middle English
dewy
English, today
dewy
From Middle English dewy, deuhy, from Old English dēawiġ, from Proto-West Germanic dauwag, dauwīg, equivalent to dew + y.
Etymology from Wiktionary, CC BY-SA