Unhappy, disconsolate.
sad, blue, unhappy, discouraged, mournful, dejected, despondent
"Glumy" does not appear to be a recognized word in English. It may be a misspelling of "glum" which means looking or feeling dejected or unhappy.
The word you might be looking for is "dejected," which means feeling sad or disheartened due to being put down or discouraged.
An operational definition
There is no universally accepted definition of intelligence because it is a complex and multifaceted concept that can be interpreted and measured in various ways. Different disciplines and cultures have different perspectives on what intelligence entails, leading to a lack of consensus on a single definition.
Crestfallen means dejected or disappointed
Unhappy, sad, down in spirit.
The adjective dejected means unhappy, disappointed, or depressed because of failure or an undesirable outcome.
Feeling or expressing unhappiness or discontent.
I am dejected (disheartened) by your answer to my question.
He felt very dejected when his parents divorced.
I was dejected from the math group (This is incorrect because the verb is intransitive.) You are going to really be dejected when I tell you that you were ejected from the math group.
There are many ways one might use the term 'crestfallen.' The definition of the word 'crestfallen' means for one to feel sad or disappointed. Crestfallen could also be used to replace dejected.
I feel so dejected because I lost a game Deena nawas
of Deject, Cast down; afflicted; low-spirited; sad; as, a dejected look or countenance.
Down and dejected after getting cut from the team, Krista went home and ate a gallon of ice cream. After losing his third tennis match, Jamison looked completely dejected.I became quite dejected after failing to climb Mt. Everest on six different occassions.
prideful