Wunjo is the letter W
Anglo-Saxon Rune Poem (from ragweedforge.com)
Bliss he enjoys who knows not suffering, sorrow nor anxiety,
and has prosperity and happiness and a good enough house
Wunjo reversed shows sorrow, anxiety and suffering. This indicates perhaps that this will be an unpleasant week, where because of there being experiences of loss, might lead to other feelings.
What is mainly lost is harmony. The regular accord you have with yourself, with spirits, with people around you is temporarily disturbed. Perhaps an assumption is made, an offering forgotten, or some part of your discipline falters. The loss of this harmony is the cause of the anxiety and suffering that you experience.