The negative aspects or drawbacks of feeling sad. In Jewish thought, particularly in Chassidic teachings, sadness is often seen as a state that can hinder spiritual growth and the ability to perform mitzvot with joy and enthusiasm. While sadness might be a natural emotional response to certain situations, its deficiency lies in its potential to paralyze action, reduce motivation, and disconnect a person from a positive, joyful connection with Hashem and others. Therefore, it is often emphasized that one should strive to overcome sadness and cultivate joy, which is seen as a more productive and spiritually uplifting state.