softheaded

from WordNet (r) 3.0 (2006)

softheaded
    adj 1: foolish; totally unsound; "a crazy scheme"; "half-baked
           ideas"; "a screwball proposal without a prayer of
           working" [syn: {crazy}, {half-baked}, {screwball},
           {softheaded}]

from The Collaborative International Dictionary of English v.0.48

Soft-headed \Soft"-head`ed\, a.
   Weak in intellect.
   [1913 Webster]