[dun.der.head] n [perh. fr. D donder thunder + E head; akin to OHG thonar thunder--more at thunder] (ca. 1625): dunce, blockhead -- dun.der.head.ed adj
DUNDERHEAD
Meaning of DUNDERHEAD in English
Merriam-Webster English vocab. Английский словарь Merriam Webster. 2012