Merriam-Webster's Word of the Day for October 31, 2023 is:

eldritch • \EL-dritch\  • adjective

Eldritch describes things that are strange or unnatural, especially in a way that inspires fear. The word is often used as a synonym for eerie.

// She's afraid to visit haunted houses because the eldritch decor and sound effects are too realistic for her liking.

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Examples:

“One of the newer entries on this list is Dredge, which is a cozy game for players who like spooky, eldritch tales of the open sea. It sounds counterintuitive to combine relaxing gameplay with horror, but it works out well here. You’ll catch eerie-looking fish, explore abandoned and sometimes dangerous areas and start dredging treasures from shipwrecks to help a mysterious collector. The joy in Dredge though comes from the casual way it lets you complete your quests and the openness of its world, which is ripe for exploration.” — Carli Velocci, CNN, 2 May 2023

Did you know?

Curse, cobweb, witch, ghost, and even Halloween—all of these potentially spooky words have roots in Old English. Eldritch, although less common, is another, hailing from a time when otherworldly beings were commonly thought to inhabit the earth. The word dates back to the 16th century and may have its origin in the Middle English word elfriche, meaning “fairyland.” (The two components of elfriche—“elf” and “riche”—come from the Old English words ælf, “elf,” and rīce, “kingdom.”) Nowadays, eldritch is used to describe things that are eerie, weird, or frightful. You may also recognize the word as the name of the popular video game Eldritch, inspired by the stories of H.P. Lovecraft, who often used the word in his horror fiction. Or perhaps you've encountered it in the role-playing game Dungeons & Dragons.