a. [ L. supinus, akin to sub under, super above. Cf. Sub-, Super-. ] 1. Lying on the back, or with the face upward; -- opposed to prone. [ 1913 Webster ]

2. Leaning backward, or inclining with exposure to the sun; sloping; inclined. [ 1913 Webster ]

If the vine
On rising ground be placed, or hills supine. Dryden. [ 1913 Webster ]

3. Negligent; heedless; indolent; listless. [ 1913 Webster ]

He became pusillanimous and supine, and openly exposed to any temptation. Woodward. [ 1913 Webster ]

Syn. -- Negligent; heedless; indolent; thoughtless; inattentive; listless; careless; drowsy. [ 1913 Webster ]

-- Su*pine"ly, adv. -- Su*pine"ness, n. [ 1913 Webster ]

n. [ L. supinum (sc. verbum), from supinus bent or thrown backward, perhaps so called because, although furnished with substantive case endings, it rests or falls back, as it were, on the verb: cf. F. supin. ] (Lat. Gram.) A verbal noun; or (according to C.F.Becker), a case of the infinitive mood ending in -um and -u, that in -um being sometimes called the former supine, and that in -u the latter supine. [ 1913 Webster ]