Disunity is the situation itself: a group that cannot agree or pull in the same direction. It is the noun that sits beside disunited. You meet it in politics, at work, in churches — anywhere people are meant to act as one body. It is a fairly formal, written word. In speech, people more often say they are divided, or they just cannot agree. Disunity is not a small quarrel over lunch; it suggests the group is weaker because it is pulling apart. You hear of disunity in a party, disunity among leaders, religious disunity. Though actually, a group can argue and still be united in what it wants; disunity is when the arguing means they stop working as a group at all.