The antonyms for the word "disconcerted" are composed, calm, relaxed, comfortable, poised, confident, assured, unfazed, collected, and indifferent. Composed represents someone who is calm and collected in the face of a stressful situation. The term relaxed means anxiety-free and at ease. The term comfortable represents a state of being content and feeling safe. Poised indicates someone who is ready and waiting for anything. Confident refers to people who have a strong belief in their ability. Assured represents being fully confident or certain. Unfazed means unaffected, not distressed by any situation. Collected suggests someone who remains in control of their emotions, and Indifferent refers to someone who is unaffected by any situation, who shows no interest or concern.