Understanding free from cankers (Buddhism)

This is understanding unaffected by cankers, not the object of cankers.

On the Path of Purification of Hinayana Buddhism, panna (understanding) is considered as of one kind (monad), of two kinds (dyads), of three kinds (triads) or of four kinds (tetrads). There are five dyads, four triads and two tetrads. All have the characteristic of penetrating the individual essences or true nature of states (monad). In the second dyad, this is contrasted with understanding subject to cankers.