Answer: Machhapuchare
or is it? cause there's a lot of mountains that remained unclimbed
for example:
-Gangkhar Puensum, Bhutan. Widely considered the highest unclimbed mountain in the world at 7,570m, Gangkhar Puensum can be found in in Bhutan and lies on the border with China. ...
-Muchu Chhish, Pakistan. ...
-Mount Kailash, Tibet. ...
-Karjiang, Tibet.
just correct me if I'm wrong :,)