未定(みてい)

みてい
noun, na-adjective
undecided; pending; to be determined
1. undecided; pending; not yet determined; TBD
A state where something has not yet been decided or finalized. Used for schedules, plans, personnel decisions, and any situation awaiting a decision.
日程(にってい)は未定(みてい)です。
The schedule is undecided.
開催(かいさい)場所(ばしょ)はまだ未定(みてい)だが、来月中(らいげつちゅう)に決(き)まる予定(よてい)だ。
The venue hasn't been decided yet, but it's expected to be finalized within next month.
後任(こうにん)の人事(じんじ)は未定(みてい)のまま、前任者(ぜんにんしゃ)が退職(たいしょく)してしまった。
The predecessor left the company while the successor's appointment was still undecided.

A compound of 未(み) (not yet) and 定(てい) (fixed, decided). The prefix 未(み)～ is productive and appears in many words: 未定(みてい), 未満(みまん), 未知(みち), 未来(みらい).

Often abbreviated as TBD (to be determined) in bilingual business contexts.

Similar words

Common collocations

  • 日時(にちじ)未定(みてい) (date and time undecided)
  • 未定(みてい)のまま (remaining undecided)
  • まだ未定(みてい) (still undecided)

Related Words

Antonym: 確定(かくてい) (determined, definite)
Compare: 保留(ほりゅう) (means 'on hold')
Compare: 検討(けんとう)中(ちゅう) (means 'under consideration')
Related: 未解決(みかいけつ) (unresolved)
Compare: 不定(ふてい) (indefinite)
Compare: 不確定(ふかくてい) (uncertain)
Compare: 保留中(ほりゅうちゅう) (on hold)
Related: 未開封(みかいふう) (unopened, sealed)
Related: 未払(みばら)い (unpaid)
general
Added 2026.3.4 17:08 · Revised 2026.10.18 9:52
14500/14985_mitei