What is the meaning of Vicious?

Violent, destructive and cruel.

Savage and aggressive.

Pertaining to vice; characterised by immorality or depravity.

Iniquitous, sinful, wicked (often in a way that causes harm or vice to/in others)

Lacking purity or cleanness; spoiled or defiled.

Inaccurate, modified, or debased; of substandard quality.

Injurious, dangerous; causing serious harm.

vicious; malicious

defective; not capable of functioning

Source: wiktionary.org