Grammatical Analysis
Uddhacca: [nt.] Restlessness; agitation; distraction; mental flurry. Derived from prefix ud (up, over) + root dhu (to shake, to agitate).
Orthodox Definition
Uddhacca operates in Theravāda psychology on two levels: as a hindrance (nīvaraṇa) and as the ninth Fetter (saṃyojana).
As an ultimate reality (cetasika), uddhacca is present in every single unwholesome mind-moment. It is the characteristic of an unquiet mind, like water whipped up by the wind, preventing the mind from resting peacefully on an object.
As a fetter, it is one of the very last defilements to be uprooted. Even Non-Returners (Anāgāmīs), who have destroyed all sensual lust and anger, still experience microscopic ripples of mental agitation regarding the supreme goal. Only the Arahat, who has completely attained the unconditioned, possesses a mind totally free from uddhacca, resulting in absolute, unshakeable stillness.
Textual References
- Abhidhamma: Dhammasaṅgaṇī – Classifying restlessness as a universal unwholesome mental factor (sabbākusalasādhāraṇa).
- Commentary: Atthasālinī – Providing the simile of throwing a stone into a pile of ashes; uddhacca is the resulting cloud of dust that obscures clear vision.