undecided, not yet decided, undetermined
“未定だけど疲れたから少し休むわ”
I haven’t decided yet, but I’m tired, so I’m going to rest for a bit.
— 落下の解剖学 (2023)
計画はまだ未定である。
The plans have not been finalized yet.
まだ未定よ
It hasn't been decided yet.
— サスペリア (1977)