There are several synonyms for the phrase "be painless." One can say "be effortless," "be untroubled," "be gentle," "be easy," or "be pain-free." All of these phrases convey the same idea of something not causing discomfort or distress. In a medical context, doctors may use the term "numb" or "anesthetized" to describe a body part that is painless. In everyday conversations, people may use phrases such as "no sweat," "no problem," or "a walk in the park" to describe a painless experience. Choosing the right synonym can help to add variety and depth to one's language and communication.