What is opposite of upright?

The opposite of "upright" depends on the context in which you are using it. Here are a few possibilities:

Physical Orientation:

* Reclining: Lying down, resting, or leaning back.

* Prone: Lying face down.

* Supine: Lying face up.

* Inverted: Upside down.

* Askew: Tilted or crooked.

* Horizontal: Parallel to the ground.

Moral or Ethical:

* Dishonest: Untruthful, deceitful.

* Corrupt: Morally depraved.

* Immoral: Unprincipled, unethical.

* Unjust: Unfair, wrong.

* Wicked: Evil, malicious.

Figurative:

* Downcast: Depressed, disheartened.

* Dejected: Discouraged, low in spirits.

* Fallen: Having lost one's position, power, or virtue.

* Submissive: Yielding to authority, lacking independence.

Please provide more context if you need a more specific opposite for "upright"!