In a ghostly or ghost-like manner; with a pale, eerie, or spectral quality.
From 'ghost' + '-y' (adjective) + '-ly' (adverb suffix, turning adjectives into adverbs). Follows the standard pattern like 'scary→scarily.'
Most adverbs in English end in '-ly,' but the letter 'y' already marks many adjectives, so we get tongue-twisters like 'ghostily' and 'eerily' where the vowels cluster together.
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