What is the meaning of the word untenable?

Untenable means something that cannot be maintained or defended, especially in the context of an argument or position. When something is described as groundless, it lacks any basis in reason or fact, which aligns perfectly with the concept of being untenable. It suggests that the arguments or belief systems being referred to are weak and cannot stand up to scrutiny or defend fundamental positions. In essence, when a claim is deemed untenable, it's often because it doesn't hold any credible support or justification, making "groundless" an appropriate synonym. This understanding is crucial for interpreting various scenarios, particularly in discussions that require logical reasoning and the justification of claims.