Here are some alternatives, depending on the context you're aiming for:
More neutral/polite:
* Dumm: This is the most direct translation of "dumb," but it carries a strong negative connotation.
* Dämlich: This means "stupid" or "silly," and is a slightly less harsh term.
* Naiv: This means "naive" and implies a lack of experience or understanding.
* Unintelligent: This is a more formal and neutral way to say "unintelligent."
* Ungeschickt: This means "clumsy" or "inept" and refers more to a lack of skill or coordination.
More humorous/informal:
* Blöd: This means "stupid" but is often used in a playful or friendly way.
* Doof: Similar to "blöd," this is often used in a humorous context.
Important note: Even these alternatives can be offensive if used in the wrong context. It's always best to be mindful of the situation and choose your words carefully.
If you're looking for a more precise translation, please provide more context about what you're trying to say.