1 flat, flat on one's back, horizontal, recumbent
2 apathetic, careless, heedless, idle, incurious, indifferent, indolent, inert, languid, lazy, lethargic, listless, lymphatic, negligent, passive, slothful, sluggish, spineless, spiritless, torpid, uninterested
1 lying on one's face, prone, prostrate
English Collins Dictionary - English synonyms & Thesaurus
If you are supine, you are lying flat on your back.
...bedridden persons confined to the supine position.
Supine is also an adverb., adv ADV after v
I lay supine on the poolside grass.
Translation English Cobuild Collins Dictionary
Add your entry in the Collaborative Dictionary.