half-witted

half- +‎ witted

half-witted (not comparable)

1. Having a low intelligence; dim-witted.
   • 1886, Peter Christen Asbjørnsen, translated by H.L. Brækstad, Folk and Fairy Tales, page 264:

     "These girls were a little queer, to be sure, almost half-witted, but that came from their having seen fairies," he added, with an indignant look at the squire.

• half-wit