"supine : Lying on its back; reclined. (figuratively) Reluctant to take action due to indifference or..."

“supine : Lying on its back; reclined.
(figuratively) Reluctant to take action due to indifference or moral weakness; apathetic or passive towards something; lazy, lethargic, listless.
(rare, now poetic) Inclining or leaning backward; inclined, sloping.”

- https://en.wiktionary.org/wiki/supine#English

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