When looking for antonyms for the phrase "most unashamed", we might consider words that imply shame or embarrassment. Examples of such antonyms include "humble", "discreet", "modest", "shy", and "coy". These words suggest a sense of reserve or modesty that is the opposite of someone who is unashamed or unabashed. Other antonyms may be words that imply a sense of guilt or wrongdoing, such as "contrite", "remorseful", "apologetic", or "regretful". Each of these words suggests a different kind of emotional response that is far from the confidence and self-assuredness that comes with being unashamed.