untouchable
adj. C1 Advanced US //ənˈtətʃəbəɫ// UK //ʌntˈʌtʃəbəl// un·touch·able
adj. impossible to reach, touch, or change. You use this to describe someone who is so powerful or successful that nobody can hurt or criticize them.
adj. beyond the reach of criticism, punishment, or physical contact. Often describes a person or entity whose status or power provides immunity from legal or social consequences.
The champion seems untouchable after winning ten matches in a row.
The corrupt politician believed he was untouchable until the new evidence came to light.
In the early years of the tech boom, the company's market dominance made it appear untouchable, but shifting consumer habits eventually eroded its influence.
Usage
Often used predicatively after linking verbs like 'seem', 'feel', or 'become'.