I don’t see any examples, however, if you look at your examples gloomy is similar to sad or dreary, and the opposite of cheery or happy, so look for that in your examples
Explanation:
Chile Liberia and Germany
Answer:
Hamlet, the most famous play in English literature, continues to fascinate and challenge both readers and audiences. Interpretations of Hamlet's character and actions abound, because the play has produced so many intense and varied responses. No small indication of the tragedy's power is that actors long to play its title role, including contemporary film stars Mel Gibson and Kenneth Branagh.
Explanation:
No they aren't proper to use in writing class they are considered slang. It would show your teacher that your not interested in sounding educated and proper.
Hope this helps!