Subtle dullness is an obstacle you will encounter once you have overcome the meditation obstacles of gross dullness and gross agitation. By the time subtle dullness arises, you will often have very stable meditations; however, this can make subtle dullness difficult to spot, because we usually associate calm meditations with successful practice.

In this video, I explain what you need to look out for in terms of subtle dullness to ensure that your meditation is progressing towards greater concentration and not stagnating, and I provide various techniques for combating it.