未 means “not yet, un-”

み · mi

Also: hitherto, still

Kun'yomi (Japanese reading)
いまだ, まだ, ひつじ
On'yomi (Chinese reading)
ミ, ビ

JLPT N3 · Taught in grade 4 · 5 strokes

The story

A tree (木) whose top branch is still shorter than the one below: not grown yet. 未来, the future, is time that has not yet come, and 未成年 is anyone not yet of age; with a long top line it would be 末, the end.

Used in 未来 (mirai, future), 未成年 (miseinen, minor/underage), and 未定 (mitei, undecided)

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Readings from KANJIDIC2, © EDRDG, CC BY-SA.