Foundationless and Ill-advised

Foundationless adjective - Having no basis in reason or fact.

Ill-advised and foundationless are semantically related. In some cases you can use "Ill-advised" instead an adjective "Foundationless".

Ill-advised adjective - Showing poor judgment especially in personal relationships or social situations.

Foundationless and ill-advised are semantically related. Sometimes you can use "Foundationless" instead an adjective phrase "Ill-advised".