
dumm
stupid
Not very intelligent or clever; showing poor judgment.
Das war eine wirklich dumme Antwort auf eine einfache Frage.
That was a really stupid answer to a simple question.
stupid / unfortunate
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stupid
Not very intelligent or clever; showing poor judgment.
Das war eine wirklich dumme Antwort auf eine einfache Frage.
That was a really stupid answer to a simple question.

unfortunate
Unpleasant, annoying, or unlucky. Describes a negative situation or mishap.
Es ist dumm gelaufen, dass wir den letzten Zug verpasst haben.
It was unfortunate that we missed the last train.

to be too good for
A colloquial expression meaning that someone does not want to do something or considers it pointless.
Ich bin mir zu dumm dafür, stundenlang für ein Konzertticket anzustehen.
I'm too good for standing in line for hours for a concert ticket.
Using 'dumm' (stupid/unfortunate) for an unpleasant situation or in the expression 'sich zu dumm sein für etwas' (to be too good for something) is mainly colloquial. In more formal contexts, you would choose other expressions.
Dumm, dass ich meinen Schirm vergessen habe.
How annoying that I forgot my umbrella.
'Dumm' (stupid) can describe a person's trait or evaluate a single action. 'Er ist dumm' (He is stupid) is a strong, general statement about a person, while 'Das war dumm' (That was stupid) refers only to a specific action.
Es war dumm von mir, den Schlüssel zu vergessen.
It was stupid of me to forget the key.
When 'dumm' (stupid/unfortunate) does not refer to a person or an idea, but to a situation or event, it means 'annoying' or 'unfortunate'. A very common phrase is 'dumm gelaufen' (that went badly / bad luck).
Wir haben den Bus verpasst, das ist echt dumm gelaufen.
We missed the bus; that was really unfortunate.
The idiom 'sich für etwas zu dumm sein' does not mean that someone is intellectually incapable. It expresses that someone considers something beneath their dignity or simply doesn't feel like doing it.
Ich bin mir zu dumm dafür, drei Stunden für ein Handy anzustehen.
I'm too good for standing in line for three hours for a phone.
stupid / annoying
Dumm and blöd can both be used to judge an unwise action or a negative situation. Dumm more strongly suggests a lack of insight or common sense, while blöd is more colloquial and often expresses annoyance or regret about the situation. Dumm fits a clear criticism, while blöd fits a casual reaction to a mishap.

Es war dumm, die wichtige Adresse nicht zu prüfen.
It was stupid not to check the important address.
Es war blöd, dass ich die wichtige Adresse nicht geprüft habe.
It was annoying that I didn't check the important address.