"Creepings" is a noun that describes the act of moving slowly and stealthily, especially in a way that is considered creepy or unsettling. Some possible synonyms for this word include "lurkings," "skulkings," "creepings" (as in, multiple instances of creeping), "sneakings," and "slitherings." Other word choices that might convey a similar sense of unease or spookiness include "ghostings," "hauntings," "shadowings," "whisperings," and "spirits." Ultimately, the choice of synonyms will depend on the context and tone of your writing, but any of these options could help add an eerie or unsettling atmosphere to your description of slow and stealthy movement.