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Webster 1913 Edition

Noun.

Stupid; dull.

Shak.

, a.[beef and wit.] Dull in intellects; stupid; heavy-headed.

beef-witted ‎(comparative more beef-witted, superlative most beef-witted)

(obsolete) stupid; dull
- Shakespeare, Troilus and Cressida
  The plague of Greece upon thee, thou mongrel beef-witted lord!