All loose-lipped antonyms

adj loose-lipped

• incompatible — not compatible; unable to exist together in harmony: She asked for a divorce because they were utterly incompatible.
• unfriendly — not amicable; not friendly or kindly in disposition; unsympathetic; aloof: an unfriendly coldness of manner.
• unsociable — not sociable; having, showing, or marked by a disinclination to friendly social relations; withdrawn.
• untalkative — inclined to talk a great deal: One drink and she became very talkative.
• quiet — making no noise or sound, especially no disturbing sound: quiet neighbors.
• silent — making no sound; quiet; still: a silent motor.
• cool — Something that is cool has a temperature which is low but not very low.
• formal — being in accordance with the usual requirements, customs, etc.; conventional: to pay one's formal respects.
• reserved — kept in reserve; forming a reserve: a reserve fund; a reserve supply.
• secretive — secretory.
• mum — silent; not saying a word: to keep mum.
• still — remaining in place or at rest; motionless; stationary: to stand still.
• restrained — characterized by restraint: The actor gave a restrained performance.
• subdued — quiet; inhibited; repressed; controlled: After the argument he was much more subdued.
• uncommunicative — not inclined to talk or disclose information; reserved; taciturn.