[633] "Having abandoned dullness and drowsiness (thīna-middha)": there is dullness (thīna), there is drowsiness (middha).
Therein, what is dullness?
That which is indisposition of the mind (citta), unwieldiness, drooping, sagging; slackness, slackening, the state of being slack; dullness, being dull, the state of the mind's being dull — this is called dullness.
Therein, what is drowsiness?
That which is indisposition of the body (kāya), unwieldiness; shrouding, enveloping, barricading within; drowsiness, sleep, nodding off; sleep, sleeping, the state of being asleep — this is called drowsiness.
Thus this dullness and this drowsiness are calmed, quieted, fully stilled, ended, utterly ended, destroyed, utterly destroyed, dried up, utterly dried up, done away with. Therefore it is said: "having abandoned dullness and drowsiness."
English translation from the Pali (Siam Raṭṭha edition) — under review, not for citation.