What term best fits the idea of feeling utterly miserable?

The term "abject" is best suited to describe the feeling of being utterly miserable. This word conveys a state of extreme sadness, hopelessness, or despair. When someone is described as being in an abject condition, it often implies that they are experiencing intense suffering or degradation, signifying a depth of misery that aligns perfectly with the idea presented in the question.

In contrast, the alternative options carry opposite or unrelated meanings. "Exuberant" suggests a state of being full of energy and enthusiasm, which is far removed from feelings of misery. "Hallowed" refers to something that is regarded as holy or sacred, also not associated with any sense of misery. "Joyful" directly denotes happiness, which is again the opposite of feeling miserable. Thus, "abject" captures the essence of the profound negativity associated with feeling utterly miserable, making it the most fitting choice.