unassailable
US
UK unassailable adj: figurative (impossible to dispute)
SC 毋庸置疑的 wú yōng zhì yí de
SC 无可反驳的 wú yōng zhì yí de，wú kě fǎn bó de
SC 无可争辩的 wú yōng zhì yí de，wú kě zhēng biàn de
The scientist presented an unassailable argument for the existence of climate change.
unassailable adj: (not open to attack)
SC 攻不破的 gōng bú pò de
The town was considered unassailable because it was on top of a mountain.