indubitability n.
毋庸置疑, 明确无疑
indubitability[ noun ]
the quality of being beyond question or dispute or doubt
<noun.attribute>
indubitability \indubitability\ n.
the quality of being beyond question or dispute or doubt;
indubitableness.
Syn: indisputability, unquestionability, unquestionableness.
[WordNet 1.5]