indefinite

1. ADJ If you describe a situation or period as indefinite, you mean that people have not decided when it will end. 不確定的

The trial was adjourned for an indefinite period. 審判被無限期推遲。

2. ADJ Something that is indefinite is not exact or clear. 不明確的

...at some indefinite time in the future. …在未來不確定的某個(gè)時(shí)間。