"not yet bloomed," 1580s, from un- (1) "not" + past participle of blow (v.2).
Life is the rose's hope while yet unblown;
The reading of an ever-changing tale;
[Keats, from "Sleep and Poetry"]
unbiased
unbidden
unbind
unbleached
unblemished
unblown
unborn
unbosom
unbounded
unbowed
unbreakable
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