Sanskrit मूढ, "confusion of mind, not clear, bewildered, perpelexed, confused, idiot, imbecile"
In Patanjali's Yoga Sutras, the second bhumika (stage of concentration). Mudha refers to the dull, forgetful mind.
"Kshipta, Mudha, Vikshipta, Ekagra and Niruddha are the five Yogic Bhumikas. The Chitta or mind manifests itself in five different forms. In the Kshipta state, the rays of the mind are scattered on various objects. It is restless and jumps from one object to another. In the Mudha state, the mind is dull and forgetful. Vikshipta is the gathering mind. It is occasionally steady and, at other times, distracted. By practice of concentration, the mind struggles to gather itself. In the Ekagra state, it is one-pointed. There is only one idea present in the mind. The mind is under perfect control in the Niruddha state. Dharana is practised for stopping the modifications of the mind." - Swami Sivananda