[groan] inwardly

to remain silent instead of expressing one's disapproval or distress

The idiom "groan inwardly" originated from the literal act of emitting a groan or expressing discomfort internally, without making it audible or apparent to others. It signifies a silent or suppressed reaction to an unpleasant or frustrating situation, often indicating a feeling of exasperation, disappointment, or annoyance. The phrase is used to emphasize the internalized nature of the response, conveying a sense of restraint or self-control in not outwardly expressing one's emotions.

When the boss announced another late-night meeting, the employees groaned inwardly, knowing it meant more work and less free time.
Upon receiving yet another parking ticket, she groaned inwardly, realizing it would be an added expense to her already tight budget.
As the speaker droned on with a long, boring presentation, the audience members groaned inwardly, longing for it to end.
When he realized he had forgotten his wallet at home, he groaned inwardly, knowing he would have to go back and retrieve it.
After spending hours preparing a meal, she groaned inwardly when she accidentally dropped the dish, creating a mess that needed to be cleaned up.