DUNDERHEADED
Scrabble letter values: D2U1N1D2E1R1H4E1A1D2E1D2 = 19
Definition
DUNDERHEADED is the past tense of DUNDERHEAD.
noun DUNDERHEAD: a stupid person.
Synonyms of DUNDERHEAD: dunce, numskull, blockhead, bonehead, lunkhead, hammerhead, knucklehead, loggerhead