supine
Cross references: 1. inactive 2. prone 1. su.pine \su.-'pi-n\ \-'pi-n-n*s\ aj [L supinus; akin to L sub under, up to - more at UP] 1a: lying on the back or with the face upward 1b: marked by supination 2: manifesting mental or moral slackness : ABJECT archaic 3: leaning or sloping backward - su.pine.ly av 2. su.pine \'su:-.pi-n\ n [ME supyn, fr. LL supinum, fr. L, neut. of supinus, adj.] 1: a Latin verbal noun having an accusative of purpose in -um and an ablative of specification in -u 2: an Engligh infinitive with to
Webster's English Dictionary