Encara no tenim significats per a "add gratuitously".
1I have suffered a great deal, she added gratuitously.
2And, be it added gratuitously, Virginia deemed herself something of an adept in dealing with men.
3The work is not light, he added gratuitously.
4Though the life of a secret agent is not altogether heavenly either, if you ask me, he added gratuitously.
5"Your honour is here sooner than he looked for," he added gratuitously.