Webster's Revised Unabridged Dictionary · 1913

Resupine

Resupine , adjective

[Latin resupinus; pref. re- re- + supinus bent backward, supine.]

Lying on the back; supine; hence, careless. — Sir K. Digby
He spake, and, downward swayed, fell resupine, With his huge neck aslant. — Cowper