The term 'deep boredom' can be summarized as a state of ENNUI, which is a French word meaning listlessness or apathy. It is a feeling of dissatisfaction, restlessness, and weariness caused by lack of interest or stimulation. Deep boredom is often accompanied by feelings of emptiness, hopelessness, and depression. It can be caused by a variety of factors, such as monotony, lack of purpose, and lack of meaningful relationships.