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Douglas Harper's Etymology Dictionary
unblown

"not yet bloomed," 1580s, from un- (1) "not" + past participle of blow (v.2).\n\nLife is the rose's hope while yet unblown;\n
The reading of an ever-changing tale;\n

[Keats, "Sleep and Poetry"]

Wiktionary
unblown

a. Not having been blown (in various senses).

Usage examples of "unblown".

Helen, having laughed, weeps too, And the other chides her, and she being chid speaks naught, But cheeks and lips and eyelids kisses her Laughing, so fare they, as in their bloomless bud And full of unblown life, the blood of gods.