meaning of supine
1. Lying on the back, or with the face upward; -- opposed to prone.
2. Leaning backward, or inclining with exposure to the sun; sloping; inclined.
3. Negligent; heedless; indolent; listless.
4. 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.
5. offering no resistance; "resistless hostages"; "No other colony showed such supine, selfish helplessness in allowing her own border citizens to be mercilessly harried"- Theodore Roosevelt