The phrase "morbidly excited" can have negative connotations, implying an unhealthy or even grotesque level of enthusiasm. As such, synonyms might include: feverishly excited, maniacally thrilled, obsessively eager, or wildly enthusiastic. Alternatively, if one wants to express a similarly intense level of excitement without the potentially problematic associations of "morbid," other options could include: deliriously excited, ecstatically enthusiastic, jubilantly elated, or insanely happy. It's important to consider the context and tone of the situation when choosing a synonym, as certain words may be better suited to formal or informal situations, or may carry different nuances of meaning.