indefinite

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

The trial was adjourned for an indefinite period. 审判被无限期推迟。

2. ADJ Something that is indefinite is not exact or clear. 不明确的

...at some indefinite time in the future. …在未来不确定的某个时间。