An irritated voice tells you to go away without actually saying those words. It has a dismissive tone and is both rash and harsh. The voice is passive, but the listener can still hear the anger and frustration in the speaker’s tone.
Irritation, frustration, and anger are all fruits of the same tree. This is the type of voice you don't want to hear when you call customer service. It can turn you away instantly because it sounds so pissed off.
Kids are notorious for speaking in an angry, irritated tone when they don't get what they want. This voice can be used for multiple audiences depending on the context of the message. More often than not, an irritated voice showcases a character who is feeling angry or hopelessly defensive. Video games, audio narrations, and character films all make use of this voice to enhance their stories.
Imagine a customer service agent who takes their time to answer all your questions, however small. An irritated voice is the opposite of that. It’s impatient and you may think that the speaker is on the very edge of throwing a insult or a punch. The voice may be a bit louder than normal, or it may be soft and sarcastic.
An irritated tone can communicate explicit anger, or it can be used in an emotional context to represent accusation or blame. Lastly, this voice can also be used to represent implicit relationships, for instance, an employer bossing around their employees.