The phrase "hair raising" is typically used to describe something that is frightening or thrilling, but there are a variety of antonyms or opposites to this term. For instance, "soothing" or "calming" might imply something that is relaxing or peaceful, whereas "dull" or "boring" may suggest that the situation lacks excitement or energy. Similarly, "mundane" or "ordinary" would indicate that the experience is commonplace and predictable, while "comforting" or "reassuring" might suggest that the experience provides a sense of security and safety. Overall, the antonyms for "hair raising" tend to describe a more mellow, predictable experience that is less likely to induce fear or excitement.