The word "ununderstanding" has a simple etymology. It is formed by adding the prefix "un-" to the word "understanding". The prefix "un-" is derived from Old English and is used to indicate the opposite or negation of a word. In this case, it negates "understanding", meaning a lack or absence of understanding. The word "understand" itself comes from the combination of the Old English words "under" and "stand", which originally meant to stand under or comprehend. Over time, "understand" evolved to signify the act of comprehending or having knowledge and insight. In summary, "ununderstanding" essentially means lacking understanding or being unaware.