unimpeachable

这位法官以无可挑剔的正直闻名。

The judge is known for his ___unimpeachable integrity.

那段档案录像为当晚发生的事提供了无可辩驳的证据。

The archival footage provided ___unimpeachable proof of what had happened that night.

她作为研究者无可挑剔的资历让资助委员会的决策变得轻而易举。

Her ___unimpeachable credentials as a researcher made the funding committee's decision an easy one.