dämlich
stupid
Colloquial for very stupid, silly, or clumsy. It often expresses annoyance or contempt about behavior or a statement.
Das war eine dämliche Idee, jetzt stehen wir im Stau.
That was a stupid idea; now we're stuck in traffic.

stupid
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stupid
Colloquial for very stupid, silly, or clumsy. It often expresses annoyance or contempt about behavior or a statement.
Das war eine dämliche Idee, jetzt stehen wir im Stau.
That was a stupid idea; now we're stuck in traffic.

'Dämlich' (stupid) is a strongly colloquial and derogatory word. It should definitely be avoided in formal situations, emails, or official texts.
Sag doch nicht so was, das klingt total dämlich!
Don't say something like that; it sounds totally stupid!
The adjective is often used to negatively judge actions or qualities. Typical combinations are 'eine dämliche Frage' (a stupid question), 'ein dämliches Grinsen' (a stupid grin), or the phrase 'sich dämlich anstellen' (to act stupidly / clumsily).
Er hat sich bei der Präsentation ziemlich dämlich angestellt.
He acted pretty stupidly during the presentation.
You can also use 'dämlich' (stupid) on its own as a short exclamation to express annoyance or frustration about a stupid situation.
Ich habe den Schlüssel drinnen vergessen. Dämlich!
I forgot the key inside. Stupid!
stupid / unfortunate
'dumm' and 'dämlich' can both mean that something is not smart. 'dumm' is more general and can refer to a person, a statement, or an action. 'dämlich' is more colloquial and often sounds stronger, more annoyed, or more derogatory. People often say it when they are upset about behavior or an idea. In more neutral situations, 'dumm' is usually more appropriate; 'dämlich' fits better in spoken language and when the criticism is clear.

Karim fand es dämlich, ohne Licht mit dem Fahrrad nach Hause zu fahren.
Karim thought it was stupid to ride his bike home without lights.
Es war dumm von mir, den Termin nicht in den Kalender zu schreiben.
It was stupid of me not to write the appointment in my calendar.