We found one dictionary that defines the word slayingly:

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1. slayingly: Wiktionary

Definitions from Wiktionary (slayingly) ▸ adverb:  So as to slay. ▸ Words similar to slayingly ▸ Usage examples for slayingly ▸ Idioms related to slayingly ▸ Wikipedia articles (New!) ▸ Words that often appear near slayingly ▸ Rhymes of slayingly ▸ Invented words related to slayingly