unchallengeable

/ʌnt‍ʃˈælɪnd‍ʒəbə‍l/

/ʌntʃˈælɪndʒəbəl/

[adjective]

unchallengeable

[ADJECTIVE]

(of a belief, idea, etc.) impossible to oppose or argue with

Examples

1. However you ultimately describe that conventional account, it treats large masses of prior decisions as essentially unchallengeable starting points.

2. How is it possible that people can rise up against a seemingly unchallengeable power?