The phrase "scary door" can evoke a sense of suspense and anxiety. If you're looking for synonyms to describe this feeling, you might consider using words like eerie, ominous, spooky, unsettling, foreboding, chilling, or unnerving. Each of these words carries a slightly different connotation, but they all suggest a sense of fear or unease. Other possibilities include words like haunting, macabre, creepy, or intimidating. No matter which word you choose, it's important to think carefully about the context and the audience you're addressing, to make sure your word choice effectively communicates the desired tone or mood.