[su.pine] n [ME supyn, fr. LL supinum, fr. L, neut. of supinus, adj.] (15c) 1: a Latin verbal noun having an accusative of purpose in -um and an ablative of specification in -u
2: an English infinitive with to
[2]su.pine adj [ME suppyne, fr. L supinus; akin to L sub under, up to--more at up] (15c) 1 a: lying on the back or with the face upward b: marked by supination
2: exhibiting indolent or apathetic inertia or passivity; esp: mentally or morally slack 3 archaic: leaning or sloping backward syn see prone, inactive -- su.pine.ly adv -- su.pine.ness n