Rosy means pink and healthy, or promising well. Rosy cheeks, a rosy glow, the future looks rosy.
Of a face it means the pink of health or of cold air. Of a situation it means encouraging: a rosy picture, rosy prospects — and it is very often used sceptically, because painting a rosy picture means overstating how good things are. Rose-tinted spectacles is the fixed phrase for seeing everything too favourably. Note rosy-cheeked, and rosy-fingered dawn, which is Homer's phrase and about three thousand years old.
1adjectiverosyPink and healthy.
“The children came in with rosy cheeks and wet feet.”
2adjectivepromisingPromising well.
“The future looks rosy for the young company after its first profitable year.”
rosy is a quality of pinkness or promise.
The word is rose plus -y. Rose comes through Latin rosa, probably from a Greek borrowing of an eastern word, so the flower's name travelled a long way before it became a colour and then an outlook.
Middle English
rosy
English, today
rosy
From Middle English rosy; equivalent to rose + -y.
Etymology from Wiktionary, CC BY-SA