"Cadew" is a non-standard, invented word with no recorded meaning. As such, there is no standard spelling for it. However, based on the common English pronunciation rules, one possible spelling could be /kædu/ (cad-oo). This transcription reflects the most likely way English-speaking people would pronounce such a word, using the IPA (International Phonetic Alphabet). It should be noted that this would be a purely speculative spelling, as the original intention and meaning of the word are unknown.