Ill-advised and Off-base

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

Off-base and ill-advised are semantically related In some cases you can use "Off-base" instead an adjective phrase "Ill-advised".

Off-base adjective - Located outside a military base.

Ill-advised and off-base are semantically related in improper topic. Sometimes you can use "Ill-advised" instead an adjective phrase "Off-base", if it concerns topics such as not suitable.