Effete and Unfruitful

Effete adjective - Having lost forcefulness, courage, or spirit.

Unfruitful and effete are semantically related in unproductive topic. In some cases you can use "Unfruitful" instead an adjective "Effete", when it comes to topics like sterile.

Unfruitful adjective - Not able to produce fruit or offspring.

Effete and unfruitful are semantically related in unproductive topic. You can use "Effete" instead an adjective "Unfruitful", if it concerns topics such as not fruitful.