While it is easier and more accurate to say what Nirvana is not, if one keeps in mind thal all explanations fall short one could say that Nirvana is a state characterized by eternity (since it is unending), purity (since it is unblemished), bliss (since it is the end of all suffering and dissatisfaction), and true self-awareness (since it is the realization of the selfless nature of reality).
Lotus Seeds