There are many words and phrases that can be used as synonyms for "feel free". Some common alternatives include "don't hesitate", "feel at liberty", "be comfortable", "have no qualms", "be unrestricted", "be at ease", and "be unimpeded". Each of these phrases conveys a sense of permission and ease, indicating that the person being addressed has the freedom to act as they wish without fear of judgement or repercussion. No matter which synonym is used, the overall message remains the same - the person being addressed is encouraged to act as they see fit without having to worry about external pressures or constraints.