(also called ‘dunderpate’; plural: ‘dunderheads; pronunciation: the letter ‘u’ rhymes with the letter ‘u’ in “but” — ‘dunder’ … ‘head’)
a slow learner;
a dunce (previous entry);
When Ms Sarah, our chief supervisor, made a big scene out of a minor mistake made by a new employee, everybody on the work site concluded that she was a dunderhead not to see the simple way out to the problem.
Most celebrities are bound to be called dunderheads by their own fans on one occasion or the other.
The worst dunderheads are those politicians who cannot show solutions to the problems but who try their best to make a problem more complicated by making half-knowledge comments.