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Webster 1828 Edition

adv.

With the face upward.

Carelessly; indolently; drowsily; in a heedless, thoughtless state.

Who on beds of sin supinely lie.

supinely ‎(comparative more supinely, superlative most supinely)

- 1749, John Cleland, Fanny Hill: Memoirs of a Woman of Pleasure, Part 4
  Giddy and intoxicated as I was with such satiating draughts of pleasure, I still lay on the couch, supinely stretched out, in a delicious languor diffus'd over all my limbs