The quality or state of being ghastly, horrible, or repulsive in appearance.
From 'gashly' (an archaic variant of 'ghastly') plus the suffix '-ness' meaning the quality or condition of; represents an older spelling of what became 'ghastliness.'
This is a rare historical spelling showing how English orthography was in flux during the 16th-17th centuries, with 'gashly' and 'ghastly' competing as variants before 'ghastly' became standardized.
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