1The company's financial records were unassailable, and the auditors found no evidence of wrongdoing.
2Is the scientific consensus on climate change truly unassailable, or are there still legitimate grounds for debate?
3The historian's reputation as a leading expert in her field was unassailable, and her opinions were widely respected.
4The new encryption method was designed to be unassailable, but it was eventually cracked by a team of skilled hackers.
5There is no unassailable proof that the ancient civilization was wiped out by a natural disaster, but it remains the most widely accepted theory.