"mild frustration" is correct and can be used in written English.
It refers to a slight feeling of annoyance or irritation. Example: She felt a wave of mild frustration wash over her as she waited in line for over an hour at the grocery store.
Fan sentiment toward N.B.A. officiating generally ranges from mild frustration to fiery cynicism.
Nearly everyone has had experiences with networked information technologies that range from mild frustration to complete loss of data and functionality.
But he voiced mild frustration that Downing Street had yet to make clear what it wants from a proposed new dispensation.
Later, when all five detainees returned from an hour break and then started praying in the courtroom, delaying the hearing by 20 minutes, he expressed only mild frustration.
Many expressed mild frustration about limits on their access to damaged homes, the pace of road clearing and power restoration, and traffic jams caused by roadblocks and nonfunctioning signals.
But, given Kelly's thirty-year career as a painter, opera singer, actor, fashion illustrator, tightrope walker, musician, and ballet dancer, it's also easy to understand his mild frustration at being reduced to the cross-dresser who "does" Joni.
Though everyone's heart was in exactly the right place for the all-star tribute to Louis Armstrong that lighted up the Hollywood Bowl Wednesday night, it was initially tough to shake a mild, underlying frustration.
But there's a good reason for my (mild and proportionate) frustration.
Earlier this week, in what I assume was a mild expression of frustration with the NHL lockout, Dallas Stars announcer, the great Ralph Strangis, Tweeted: Keep saying "This too shall pass...".. and the trick to that phrase is you gotta say it when things are going well.
Cochran, I make mistakes," Lange said, peering over his eyeglasses in a mild gesture of frustration.
In the best of cases, they respond with mild annoyance and frustration, but in the worst of cases, with physical abuse.
