blöd
annoying
Expresses that a situation, event, or circumstance is annoying, unpleasant, or unfortunate.
Es ist blöd, dass der Zug schon wieder Verspätung hat.
It's annoying that the train is delayed yet again.

stupid / annoying
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annoying
Expresses that a situation, event, or circumstance is annoying, unpleasant, or unfortunate.
Es ist blöd, dass der Zug schon wieder Verspätung hat.
It's annoying that the train is delayed yet again.

The word 'blöd' (stupid/annoying) is very colloquial. In formal or professional situations, you should avoid it so as not to sound rude or too informal.
Mein Chef fand meine Idee anscheinend ziemlich blöd.
My boss apparently thought my idea was pretty stupid.
To describe an unpleasant situation, the structure 'Es ist blöd, dass ...' (It's annoying that ...) or 'Es ist blöd, wenn ...' (It's annoying when ...) is often used. The subject here is the impersonal 'es' (it).
Es ist blöd, dass ich meinen Schlüssel vergessen habe.
It's annoying that I forgot my key.
When 'blöd' describes a person or action as stupid, it often appears with words such as 'Frage' (question), 'Fehler' (mistake), or 'Idee' (idea).
Das war ein blöder Fehler, der uns viel Zeit gekostet hat.
That was a stupid mistake that cost us a lot of time.
The expression 'blöd tun' means to deliberately act stupid or ignorant. The verb 'tun' is conjugated in this expression.
Er tut nur so blöd, in Wirklichkeit kennt er die Antwort.
He's only playing dumb; in reality, he knows the answer.
bad
'schlecht' and 'blöd' can both express that something is not good or is unpleasant. 'schlecht' is more neutral and fits quality, performance, weather, conditions, or also how something is done. 'blöd' sounds more colloquial and often means: this is annoying, impractical, or went badly. Learners may confuse the words because both are negative. But 'blöd' does not always fit where you are talking precisely about quality. Also, when used about people, 'blöd' can mean 'stupid', which can quickly sound rude.

Es war blöd, dass der Film genau nach der Arbeit schon ausverkauft war.
It was annoying that the film was already sold out right after work.
Die Verbindung im Zug war so schlecht, dass ich keine Nachricht schicken konnte.
The connection on the train was so bad that I couldn't send a message.