Meaning: The meaning of gregarious is people or animals that are very social and enjoy being in crowds.
Someone who's outgoing, sociable, and fond of the company of others.
Example: This insect is gregarious and nocturnal
Synonyms: Friendly, Affable, Sociable, Cordial
Antonyms: Unfriendly, Cold, Introverted, Unsociable

Meaning: Shabby describes something that is threadbare or worn out.
It also means unfair or low-quality.
Example: A shirt with holes and stains can be said as shabby shirt.
Synonyms: Crummy, Desolate, Scruffy, Tacky, Broken-down
Antonyms: Clean, Fresh, Good, Happy, New

Meaning: Censure is a strong judgment of disapproval or criticize in a harsh manner.
Example: They were brought under official censure and forbidden to re-open the company.
Synonyms: Rebuke, Reprimand, Condemnation, Admonition
Antonyms: Praise, Acceptance, Agreement, Approval, Compliment

Meaning: Virulent is something very dangerous or harmful. It also is being especially bitter, ardent and hostile.
Example: The virulent infection took her life.
Synonyms: Deadly, Poisonous, Fatal, Malignant, Pernicious
Antonyms: Harmless, Helpful, Wholesome, Healthy

Meaning: Defunct describes something that used to exist, but is now gone.
Defunct is a person or thing that no longer lives or exists.
Example: Dinosaurs are now defunct.
Synonyms: Obsolete, Vanished, Nonexistent, Dead
Antonyms: Alive, Existent, Functioning, Operating