Disconcerted means to feel uneasy, confused or embarrassed. The antonyms for this word would be confident, comfortable, self-assured and composed. Confidence is the opposite of being disconcerted as it means being certain and assured. Being comfortable and composed denotes a state of calm and ease that is the opposite of feeling uneasy or embarrassed. Therefore, if someone is disconcerted, the opposite of their feeling would be to feel confident, comfortable, self-assured and composed. Using antonyms can enhance the language and create a better understanding of the actual sentiment or emotion being expressed.