vicious
1. [ adjective ] (of persons or their actions) able or disposed to inflict pain or suffering
Synonyms: savage cruel brutal roughshod fell barbarous
Examples:

"a barbarous crime" "brutal beatings" "cruel tortures" "Stalin's roughshod treatment of the kulaks" "a savage slap" "vicious kicks"

Related terms: inhumane
2. [ adjective ] having the nature of vice
Synonyms: evil depraved
Related terms: wicked
3. [ adjective ] marked by deep ill will; deliberately harmful
Synonyms: venomous poisonous
Examples:

"a malevolent lie" "poisonous hate...in his eyes"- Ernest Hemingway "venomous criticism" "vicious gossip"

Related terms: malevolent
Similar spelling:   viscous
  viscus
  viscose