#Yes.
The OED describes "no-brainer" as the other answers say:
- Something that requires or involves little mental effort or intelligence to perform or understand; esp. an easily made decision
But it also includes the definition you mention:
- A foolish or unintelligent person or action.
They quote the sentence: "If a no-brainer wants to talk on the radio—even if the message makes no sense whatsoever—he or she can do it."
It's worth noting that as a native English speaker, I wasn't familiar with this definition (and neither it seems, were the other answerers), so while it does exist, I would advise against using it unless you hear it often in your region.