This voice is dull, flat, and has no emotion to it. A monotone voice doesn't vary its pitch, and can really be a conversation killer. Someone who speaks in a monotone simply conveys the message, plainly, without showing any excitement for the subject.
There are types of monotone voice. There is the creepy monotone where the speaker uses a deep voice and doesn't stress any syllables in their speech. And then there is the calm monotone where the speaker uses a low volume. The thing about having a monotone voice is that people can never really tell if you are upset or when you are being sarcastic.
This is the type of voice that lacks color and can come across as emotionless, almost machine-like. Animations love to use a monotone to represent talking robots and space ships. Phone companies also use this voice to record interactive voice response messages. It is used to represent futuristic characters in animations. Voice assistants like Siri and Google Assistant also have this voice, but it is not all serious applications. A monotone can also be used as a form of deadpan comedy_dry humor with a blunt and expressionless delivery.
All you have to do is keep a consistent pitch and volume. Don't show any emotions in your speech by getting to excited or too frustrated. A monotone is what happens when a nonchalant voice goes too far. Speakers with a monotone voice are perceived as boring, uninterested, and kinda shifty. This is why it’s important to use this voice in context. In film, a monotone is used to represent characters with a mental illness like bipolar or depression.
A new study has shown that men with a monotone voice are found more attractive than those with deep voices. Men with these voices are considered confident.