soft-headed

Well, guess different next time; for he's out there waitin' for me—the soft-headed Dutchman!

And a group of soft-headed fools had concurred, so that one now had to tolerate periodic days of idleness.

He lay on the floor, said he, and yelled for fatted calf; but there was no soft-headed parent to supply it.

If he isn't quite so bright, they call him soft-headed; if he won't be coaxed nor turned, they call him pig-headed.