open-ended

形容词 open-ended:

1. without fixed limits or restrictions
2. allowing for a spontaneous response
3. allowing for future changes or revisions

o.pen-end.ed

adj.（形容词）
Not restrained by definite limits, restrictions, or structure.
无限制的：没有明确限度、规则或框架限制的
Allowing for or adaptable to change.
可以随意更改的
Inconclusive or indefinite:
未下结论的或未确定的：
例句：
.faintly bemused and uneasily open-ended about the whole horrible business.(Charles Michener)
.整个不景气的行业处于无力地困惑与很难确定的状态中.(查尔斯·米切纳)

Allowing for a spontaneous, unstructured response:
允许发自内心或不受限制回答的：
例句：
an open-ended question.
一个不受限制的问题