शब्दों के समूह के लिए एक-शब्द प्रतिस्थापन के रूप में उपयोग किए जा सकने वाले विकल्प का चयन करें: Unable to speak distinctly or express oneself clearly

Choose the most suitable 'one word' for the given expression: 'A person who does not believe in the existence of God or gods'

Which one-word term is used to describe an animal or person that prefers to live, move, or associate in groups rather than in isolation, exhibiting a natural inclination for companionship?