Albern vs. dumm vs. töricht
When describing foolishness in German, choosing the right word depends heavily on context. Albern describes behavior that is playful or childish, dumm refers to a general lack of intelligence or a bad mistake, and töricht is a formal term referring to a lack of wisdom or judgment.
Albern
B1This word describes behavior that is silly, goofy, or childish. It is used when someone is not acting seriously, giggling too much, or being ridiculous in a playful or immature way. It does not necessarily imply low intelligence, but rather a lack of seriousness.
Hör auf, so albern zu sein, wir sind hier bei der Arbeit.
(Stop being so silly, we are at work here.)
Der Film war unglaublich albern, aber ich habe trotzdem gelacht.
(The movie was incredibly silly, but I laughed anyway.)
Ich finde es albern, dass er immer noch ein Kuscheltier im Bett hat.
(I find it childish that he still has a stuffed animal in bed.)
Sie kicherten über den albernen Witz.
(They giggled at the goofy joke.)
Sein albernes Verhalten ging dem Lehrer auf die Nerven.
(His silly behavior got on the teacher's nerves.)
Dumm
A2This is the most common and direct word for stupid or dumb. It indicates a lack of intelligence, knowledge, or mental capacity. It can refer to a person, an idea, a mistake, or an annoying situation.
Es gibt keine dummen Fragen, nur dumme Antworten.
(There are no stupid questions, only stupid answers.)
Das war eine wirklich dumme Entscheidung von mir.
(That was a really stupid decision of mine.)
Ich fühle mich dumm, weil ich den Test nicht bestanden habe.
(I feel dumb because I did not pass the test.)
Es ist dumm, ohne Jacke in die Kälte zu gehen.
(It is stupid to go out into the cold without a jacket.)
Das ist ganz schön dumm gelaufen.
(That went pretty badly (stupidly).)
Töricht
C1This is a formal, slightly literary, or old-fashioned word meaning foolish or unwise. It describes actions that show a lack of good sense, prudence, or wisdom, rather than just low IQ. It is often found in fables, moral warnings, or sophisticated writing.
Es wäre töricht, diesen Rat zu ignorieren.
(It would be foolish to ignore this advice.)
Er erkannte zu spät, dass sein Stolz töricht war.
(He realized too late that his pride was foolish.)
Ein törichter Mann baut sein Haus auf Sand.
(A foolish man builds his house on sand.)
Sie bereute ihre törichte Verschwendung von Geld.
(She regretted her unwise waste of money.)
Es ist eine törichte Hoffnung, dass sich alles von selbst löst.
(It is a foolish hope that everything will resolve itself.)
Summary
To summarize, use albern for playful or annoying childishness, dumm for general stupidity or mistakes, and töricht when you want to sound formal and describe an unwise lack of judgment.