The grumpy, sullen gaze expresses dissatisfaction. Is not enthusiastic about a thing and shows that. Expression of disinterest and disapproval.
The unamused face emoji was introduced in 2010 and released as part of the Unicode 11.0 standard. This emoji can be found under the smileys and emotions
category. Because the unamused face emoji has been around for quite some time, it should display correctly in the majority of operating systems.