Life's a bitch is an idiom that is commonly used to express frustration or disappointment with one's circumstances. While the original phrase is quite blunt, there are many other synonyms that can be used to convey the same sentiment in a more tactful manner. For instance, one might say that life can be challenging, daunting, or even overwhelming at times. Alternatively, someone may suggest that life is unpredictable, unfair, or unforgiving. It's essential to choose the right synonym because the way we communicate our emotions can influence how we feel about them. Whatever the phrasing, it's essential to remember that everyone experiences setbacks and frustrations in life, and it's how we deal with them that counts.