Synonyms:
tenable, well-founded
Meaning: based on sound reasoning or evidence; "well-founded suspicions"
Usage examples
You have been led from the extreme of independence to the extreme of subjection without meeting with a single tenable position for shelter or repose.
The only tenable ground of condemnation would be, that with the personal tastes and self-regarding concerns of individuals the public has no business to interfere.
If any one could point out an intermediate and yet a tenable position between the complete independence and the entire subjection of the public expression of opinion, I should perhaps be inclined to adopt it; but the difficulty is to discover this position.