SUPI'NE, a. [L. supinus.] Lying on the back, or with the face upward; opposed to prone.
1. Leaning backward; or inclining with exposure to the sun. If the vine On rising ground be plac'd on hills supine--2. Negligent; heedless; indolent; thoughtless; inattentive. He became pusillanimous and supine, and openly exposed to any temptation. These men suffer by their supine credulity.