supinus

From Proto-Indo-European *(s)upo (“up, from below”) (whence sub). Doublet of suppus and supa (“part of a sacrificed animal”). Compare Ancient Greek ὕπτιος (húptios, “backwards, lazy, careless, passive”), from ὑπό (hupó).

• (Classical) IPA^(key): /suˈpiː.nus/, [s̠ʊˈpiːnʊs̠]
• (modern Italianate Ecclesiastical) IPA^(key): /suˈpi.nus/, [suˈpiːnus]

supīnus (feminine supīna, neuter supīnum, superlative supinissimus); first/second-declension adjective

1. lying down with face upwards; supine, on one's back
2. backwards, retrograde
3. careless, thoughtless, heedless, negligent, indolent
4. (grammar) supine

First/second-declension adjective.

• prōnus

• “supinus”, in Charlton T. Lewis and Charles Short (1879) A Latin Dictionary, Oxford: Clarendon Press
• “supinus”, in Charlton T. Lewis (1891) An Elementary Latin Dictionary, New York: Harper & Brothers
• supinus in Gaffiot, Félix (1934) Dictionnaire illustré latin-français, Hachette.
• Carl Meißner, Henry William Auden (1894) Latin Phrase-Book‎, London: Macmillan and Co.
  • (ambiguous) to raise the hands to heaven (attitude of prayer): (supinas) manus ad caelum tendere
    
• De Vaan, Michiel (2008) Etymological Dictionary of Latin and the other Italic Languages (Leiden Indo-European Etymological Dictionary Series; 7), Leiden, Boston: Brill, →ISBN, pages 594–595, 600–601, 601–602