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.
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.
bad
'schlecht' and 'doof' can both express that you see something negatively. 'schlecht' is more neutral and more precise when talking about quality, results, or unfavorable conditions. 'doof' is colloquial and sounds more personal: it is often used when a situation is annoying, unpleasant, or boring. Learners may confuse the words because both seem similar in simple sentences like 'Das ist schlecht' and 'Das ist doof'. But 'doof' does not fit well in formal situations, and for actual quality or performance, 'schlecht' is usually more precise.
Wegen des Regens fiel das Training aus, und alle fanden das doof.
Because of the rain, training was canceled, and everyone thought that was annoying.
Im Urlaub war das Zimmer sauber, aber das WLAN war sehr schlecht.
On vacation, the room was clean, but the Wi-Fi was very bad.