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Webster 1828 Edition

Noun.

Foolish; stupid. [Not in use.]

gullish ‎(comparative more gullish, superlative most gullish)

(archaic) Foolish, credulous, simple-minded.
- 1621, Robert Burton, The Anatomy of Melancholy, New York, 2001, p.115:
  besides this inbred neglect of liberal sciences and all arts, which should excolere mentem, polish the mind, they have most part some gullish humour or other, by which they are led […].