Nefarious (adjective)

1. Wicked, evil, or morally wrong.
2. Deserving of condemnation or disapprobation.

Origin:

Derived from the latin word 'nefarius' meaning 'wicked' or 'evil'.

Examples:

1. The nefarious actions of the criminal organization caused widespread harm to innocent people.
2. The nefarious scheme of the con artist was uncovered by the authorities.
3. The nefarious plot of the spy was discovered just in time to prevent its execution.
4. The nefarious intentions of the dictator were revealed by his speeches and actions.
5. The nefarious influence of the lobbyist was behind the passage of the controversial bill.