stupid / annoying / boring
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stupid
A colloquial expression for unintelligent, dumb, or of low intelligence. It is often used to describe someone's behavior or a statement as not smart.
Stell dich nicht so doof, du weißt genau, was ich meine.
Don't act so stupid; you know exactly what I mean.
annoying
A colloquial expression for unpleasant, annoying, or bad. It describes a situation or circumstance that is perceived negatively.
Ich finde es total doof, dass der Bus schon wieder Verspätung hat.
I think it's really annoying that the bus is late again.
boring
A colloquial expression for boring or uninteresting.
Die Party war echt doof, deshalb bin ich früher gegangen.
The party was really boring, so I left early.
The word 'doof' (stupid / annoying / boring) is used almost exclusively in colloquial language. In formal or written contexts, such as in a job application, it is inappropriate.
Ich hatte heute einen echt doofen Tag.
I had a really annoying day today.
The meaning of 'doof' depends strongly on the context. If it refers to a person or an action, it usually means 'dumm' (stupid). If it refers to a situation or event, it is more likely to mean 'ärgerlich' (annoying) or 'langweilig' (boring).
Das war eine doofe Idee von mir.
That was a stupid idea of mine.
In the meaning 'unklug' (not smart), 'doof' is often combined with verbs of behavior. Typical phrases are 'sich doof anstellen' (to act stupid / be clumsy) or 'doof gucken' (to look stupid / look puzzled).
Stell dich nicht so doof an, du kannst das doch!
Don't be so stupid about it; you can do this!
To express that a situation is annoying, 'doof' is very often used in the structure 'Es ist doof, dass…' (It's annoying that…) or 'Ich finde es doof, dass…' (I think it's annoying that…).
Ich finde es doof, dass der Supermarkt sonntags geschlossen ist.
I think it's annoying that the supermarket is closed on Sundays.
stupid / unfortunate
Dumm and doof can both describe an unwise action or statement. Dumm more clearly points to a lack of intelligence or good judgment, while doof sounds more casual and often more childish. Dumm is more appropriate in serious criticism, while doof is more appropriate in an everyday, less harsh reaction.
Es war doof, die Warnung vor dem Sturm zu ignorieren.
It was dumb to ignore the warning about the storm.
Es war dumm, die Warnung vor dem Sturm zu ignorieren.
It was stupid to ignore the warning about the storm.
