Which word is most nearly opposite in the meaning of righteous?

The most nearly opposite word to "righteous" depends on the context, but here are a few strong contenders:

* Unrighteous: This is the most direct opposite, meaning not righteous, or wicked.

* Wicked: This implies moral depravity and evil intentions.

* Corrupt: This suggests moral decay and dishonesty.

* Unjust: This emphasizes the absence of fairness and rightness.

* Iniquitous: This implies gross injustice and wickedness.

* Sinful: This implies a violation of moral or religious laws.

The best choice will depend on the specific context of your usage.