The kleśas are the afflictions that colour the mind and drive action. The Yoga Sūtras name five: ignorance, the sense of I, attachment, aversion and the clinging to life, with ignorance as the field of the rest. Buddhism uses the word for the defilements, chiefly greed, hatred and delusion.
Kleśa
Affliction: the root causes of suffering, such as ignorance, egoism, attachment, aversion and clinging to life.
Also: Klesha, kilesa, affliction