Per my test, I can retrieve group description by following code, please make a reference
using (ClientContext clientContext = new ClientContext("http://MyServer/sites/MySiteCollection"))
{
// Get all the groups at site level
GroupCollection oGroupCollection = clientcontext.Web.SiteGroups;
clientcontext.Load(oGroupCollection);
clientcontext.ExecuteQuery();
// Iterate through each group
foreach (Group oGroup in oGroupCollection)
{
Console.WriteLine("-------------title-------------");
Console.WriteLine(oGroup.Title);
Console.WriteLine("-------------Description-------------");
Console.WriteLine(oGroup.Description);
}
}
Here is the test result
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