unassailed

Unassailed describes something that has not been attacked, challenged, or called into question.

A person's reputation may remain unassailed despite controversy, or an argument may go unassailed when no one disputes it.

The word often appears in contexts where attack or criticism might reasonably be expected but hasn't materialized: Her record in office remained unassailed by opponents.

It carries a sense of something standing firm, whether through strength or simply lack of opposition.