The term dis-concert means to disturb, unsettle or confuse someone. The antonyms for this word can be words like calm, soothe, composed, placid, reconcile or reassure. A calm mind is the opposite of a disturbed or disconcerting mind. Soothe, on the other hand, means to relieve or ease the disturbing feelings. Composed, tranquil and placid mean being cool and collected, unruffled and untroubled. Reconcile means to resolve, to make peace or to settle. Ultimately, reassure means to comfort, encourage and give confidence to someone. These antonyms present a spectrum of actions where one can achieve peace and comfort of mind.