Hsi Wu is a Chinese word that means "irregular" or "unusual." It can be challenging to find synonyms for this term because it implies that something is not typical or doesn't follow the usual pattern. Some possible synonyms for Hsi Wu could include "peculiar," "unconventional," "unorthodox," "abnormal," or "out of the ordinary." Additionally, the words "nonconformist," "anomalous," "deviant," "idiosyncratic," "distinctive," or "irregularly-shaped" could also be considered synonyms for this term. Essentially, any word that describes something that doesn't fit neatly into expected categories or norms would be a potential synonym for Hsi Wu.