Enlightened 

To reach a state of better understanding and
acceptance through patience, self-exploration,
and mindfulness.

Curmudgeon

A crusty, ill-tempered, and usually old man.

Someone who possesses wisdom and insight (the "enlightened" part) but still holds onto a certain level of grumpiness or skepticism (the "curmudgeon" aspect).Think of it as someone who has seen a lot, learned a lot, and while they understand how things work and perhaps even see the potential for good, they're not easily impressed by superficiality or naive optimism. They might offer sharp, witty critiques, but their insights often hold a kernel of truth and are delivered with a knowing twinkle in their eye. They're not necessarily negative for the sake of being negative. Instead, their curmudgeonly nature might stem from a deep understanding of the world's imperfections and a weariness of repeating past mistakes. Their "enlightenment" allows them to see beyond the immediate frustrations and offer valuable, albeit sometimes gruff, perspectives