Kleśas (Sanskrit: kleśa; Pāḷi: Kilesa), in Buddhism, are mental states that cloud the mind and manifest in unwholesome actions. Kleśas include states of mind such as anxiety, fear, anger, jealousy, desire, depression, etc. All Buddhist schools teach that through Tranquillity (Śamatha) meditation the Kilesas are pacified, though not eradicated, and through Insight (Vipassana) the true nature of the Kilesas and the mind itself is understood.