Su·pine a.
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.
If the vine
On rising ground be placed, or hills supine. --Dryden.
3. Negligent; heedless; indolent; listless.
He became pusillanimous and supine, and openly exposed to any temptation. --Woodward.
Syn: -- Negligent; heedless; indolent; thoughtless; inattentive; listless; careless; drowsy.
-- Su*pine*ly, adv. -- Su*pine*ness, n.