To become frustrated means to feel upset, annoyed or impatient because you are unable to achieve something or find a solution to a problem. Full definition
I realized I had gotten off - track eight years ago after becoming frustrated with the lack of results from my print and online ads. (realtormag.realtor.org)
Patients can quickly become frustrated when it comes to dealing with health care providers and medical bills over the phone. (medicalcodingandbilling.com)
But as a serial entrepreneur, he was a client who became frustrated by the delivery of legal services. (lawsitesblog.com)