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Webster 1828 Edition

Noun.

Relish; pleasantness to the taste.

gustfulness ‎(uncountable)

(obsolete) Appealing taste; tastiness.
- Barrow
  Then his food doth taste savourily, then his divertisements and recreations have a lively gustfulness.
- Thomas Harmer
  It was not any gustfulness in those herbs which they eat, which caused them to gather them, or the force of long-established habit, but the extremity of want.