These words share the meaning of making known something previously unknown or secret. Reveal suggests uncovering something personal, secret, or unexpected that makes an impact and may involve some drama: He reveals the truth about his sister; The study revealed a gross discrepancy. Divulge suggests an often deliberate act of communicating, and making public, information that has been kept private, confidential, or secret. Things that are commonly divulged include details, facts, names, identities, and sources—information for which there may be legal, ethical, or professional reasons for divulging or not divulging: The police have not divulged the identity of the victim; Journalists refused to divulge their sources.

Both words are used to describe people who are very sociable, comfortable, or confident in the company of others. Outgoing, the more common and informal word, describes someone who behaves in a friendly, lively way, is less inhibited than the average person, and readily engages in conversation with others, whether friends or strangers. You’ll find gregarious is often used in much the same way, and it is accepted as a strong, more formal synonym for outgoing. However, in most dictionaries it is defined as “enjoying the company of others,” which is an extension of its other, older definition that refers to animals that live in herds rather than alone. So, strictly following the definition, gregarious doesn’t necessarily imply any particular behavior with others, except the preference to be with others (like a bird in a flock), or to be social.

Both words refer to keeping an action or process going without interruption. With continue, the subject can persist in its own movement (I continued to dance) or keep something else going (They continued the conversation), whereas sustain is limited to the latter case and always takes a noun as its direct object (How did you manage to sustain the conversation?). In terms of meaning, continue emphasizes an activity that is kept up, while sustain implies keeping something in existence or making it last: sustain economic growth; sustain the momentum or pace.