We found one dictionary that defines the word spookishly:

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1. spookishly: Wiktionary

Definitions from Wiktionary (spookishly) ▸ adverb:  In a spookish manner. ▸ Words similar to spookishly ▸ Usage examples for spookishly ▸ Idioms related to spookishly ▸ Wikipedia articles (New!) ▸ Words that often appear near spookishly ▸ Rhymes of spookishly ▸ Invented words related to spookishly