supine

Lying on the back or having the face upward.

Having the palm upward. Used of the hand.

Marked by or showing lethargy, passivity, or blameworthy indifference.

In Latin grammar, a verbal noun used in only a few syntactic constructions and occurring in only two cases, an accusative in -tum or -sum and an ablative in -tū or -sū. The accusative form of the supine is sometimes considered to be the fourth principal part of the Latin verb.

Lying on the back, or with the face upward: opposed to prone.