未明【みめい】
early dawn, grey of morning, gray of morning
未来【みらい】
(distant) future, future existence, world beyond the grave, the world to come, future (tense)
未満【みまん】
less than, under, below
未定【みてい】
not yet fixed, undecided, pending
未遂【みすい】
failed attempt (at a crime, suicide, etc.)
未婚【みこん】
unmarried, not yet married
未知【みち】
not yet known, unknown, strange
未成年【みせいねん】
minor, not of age
未然【みぜん】
before it happens, previously
前代未聞【ぜんだいみもん】
unheard-of, unprecedented, unparalleled in history (unparallelled), record-breaking
未熟【みじゅく】
unripe, green, inexperienced, immature, unskilled
未亡人【みぼうじん】
widow
未練【みれん】
lingering attachment, lingering affection, regret, reluctance, ruefulness
未完成【みかんせい】
incomplete, unfinished, imperfect
未納【みのう】
payment default, overdue on a payment
未開【みかい】
uncivilized, uncivilised, primitive, savage, undeveloped (land), unexplored (territory, field, etc.), unbloomed (flower)
未決【みけつ】
pending, undecided, unconvicted, awaiting judgement