Meaning of frivolous rebuke

Explanation: Here, in the chapter, The Portrait of Lady the given phrase “Frivolous rebuke”  is used when the old lonely grandmother scolds the sparrows when they sit on her head and shoulders even though she loved this action, this means the phrase is used for scolding someone in a silly manner or loving manner.

Final Answer: The meaning of the phrase “Frivolous Rebuke” is scolding in a silly or loving manner.