未払い（みはらい）：unpaid; overdue

未：1-3 PM; eighth sign of the Chinese zodiac; even now; hitherto; not yet; sign of the ram; still; un-

on-reading ビ、ミ. kun-reading いまだ、ひつじ、まだ.

未だ（いまだ）：1. as yet; hitherto; still (usually kana) 2. not yet (with negative verb) 

未（ひつじ）：eighth sign of the Chinese zodiac (the Ram, 1 pm - 3 pm, south-southwest, June)

未だ（まだ）：1. as yet; hitherto; still (usually kana) 2. not yet (with negative verb) (much more common than いまだ）

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払：already covered here.