If you are bummed, you are very unhappy because you have been experiencing difficulties that you think you will not be able to overcome.
①I'm so bummed I can't tweet anymore.
②You must be really bummed out.
③She’s bummed because they wrote her character out of the series.
If someone is sombre, they are serious or sad.
He had a somber expression on his face.
Very unhappy because you do not believe that an unpleasant situation will improve.
I feel despondent when my work is rejected.
To push the envelope means to go beyond the limits of what is usual.
①Oh, yeah, they always have me on to push the envelope.
②That guy really likes to push the envelope.
“They are pushing the envelop and really doing incredible work”
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