Tenable (adjective)

Able to be maintained or defended against attack or objection; sound; valid.

Origin:

From latin tenere "to hold".

Examples:

1. The argument was not tenable and was easily disproved.
2. The theory is still tenable and has not been disproved.
3. The company's financial position is tenable.
4. The solution proposed is not tenable in the long term.
5. The claim is not tenable in light of the new evidence.