Superlative form of ghostly; most ghost-like, spectral, pale, or eerie in appearance or quality.
From 'ghostly' + '-est' superlative suffix. The highest degree of the ghostly quality.
Creating superlatives with '-est' is ancient in English, going back over a thousand years—comparing 'ghostly/ghostlier/ghostliest' follows the same pattern as 'good/better/best,' showing incredible stability in how we express extremes.
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