(s·pīn′) adjective
1. Lying on the back, or with the face turned upward.
2. Having no interest or care; inactive; indolent; negligent; indifferent; listless.
3. Having an inclined position; sloping, as a hill. [<L supinus <sup-, root of super above]
—su·pine′ly adverb
—su·pine′ness noun

(s′pīn) noun
In Latin grammar, one of two parts of the verb, generally regarded as verbal nouns. The first or former supine, an accusative form in -um, is used after verbs of motion to express purpose, as in Processit libatum He went forth to sacrifice; the second or latter supine, an ablative form in -u, is used for specification, as in Mirabile dictu! Wonderful to relate! [<L supinum (verbum) (a) supine (word), neut. of supinus SUPINE¹]