spookily

adv

1. In a spooky manner; eerily.

   “Rock bands record classic albums, while pop stars create "guilty pleasure" singles. It's supposed to be self-evident: U2's entire oeuvre deserves respectful consideration, while a spookily seductive song by an R&B singer named Tweet can only be, in the smug words of a recent VH1 special, "awesomely bad."”