Unsound and Untenable

Unsound adjective - Having or showing a very abnormal or sick state of mind.

Untenable is a synonym for unsound in false topic. In some cases you can use "Untenable" instead an adjective "Unsound", when it comes to topics like illogical.

Nearby Words: unsounded, unsoundly

Untenable adjective - (of theories etc) incapable of being defended or justified.

Unsound is a synonym for untenable in indefensible topic. You can use "Unsound" instead an adjective "Untenable", if it concerns topics such as false, illogical.