An archaic or dialectal term for a foolish or dizzy person; someone who is silly or confused.
From dizzy (confused or silly) plus the suffix -ard (indicating someone characterized by a quality), creating an old-fashioned insult for a foolish person.
A 'dizzard' is what people called a silly person centuries ago—now we'd just say 'ditz,' showing how insult words keep getting refreshed while the meaning stays the same!
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