Supervacaneous is a rare and obscure word, which means unnecessary or superfluous. Some synonyms of this word include redundant, extraneous, unnecessary, surplus, excessive, and overabundant. These words express the idea of something being more than required or desired, and are often used to describe situations where there is an excess or surplus of something. Other synonyms for supervacaneous include needless, uncalled for, unwanted, unwanted attention, and unnecessary interference. When used in a sentence, the word supervacaneous signals that something is not needed or necessary, and it implies that something could be removed or eliminated without affecting the outcome or result.