noun which may take the genitive case particle 'no', na-adjective, noun
undecided; not yet fixed; pending
Used for schedules, plans, details, or decisions that are still open or unconfirmed. Often appears in formal announcements, itineraries, and business contexts. Antonym: 既定 (already decided).
Antonyms: 既定
会議の日程はまだ未定です。
The meeting date is still undecided.
詳細は未定ですが、来月には発表できると思います。
The details are not yet fixed, but I think we can announce them next month.
The travel schedule is still undecided.
Preparations for the event are moving forward even though the venue is still undecided.
未定 means not yet decided, contrasting with 所定, which describes something already fixed or prescribed.