In a spooky manner Crossword Clue

 The answer to the crossword clue "In a spooky manner" is EERILY. It has 6 letters.

Here are some other words that can be used to describe something that is done in a spooky manner:

Ghastly

Mysterious

Ominous

Unsettling

Eerie

Creepy

Terrifying

Frightening

Hair-raising

Chilling

I hope this helps!