The Collaborative International Dictionary
Soft-headed \Soft"-head`ed\, a. Weak in intellect.
Wiktionary
a. (alternative spelling of softheaded English)
Usage examples of "soft-headed".
I have not set down too many dates, for the setting down of dates in much profusion is, after all, an ad captandum appeal to the suffrages of those soft-headed creatures who are styled serious men.
There was further discussion of the sort Aman indulges in when carrying out these quasi-poetic analogies of his, about soft feathers and delicate coloring but even when he is being smooth-tongued and soft-headed he can be acute.
Not only that, but you will be volunteering your descendents for the muggy, sore-head way of life peculiar to persons who might have been rich and free, had not a soft-headed ancestor piddled a fortune away.