Dissensious is a seldom-used word, meaning "quarrelsome" or "contentious." It is spelled with a "d" and four syllables: [dɪˈsɛnʃəs]. The first two syllables, "di" and "sen," follow regular English spelling conventions. The third syllable, "sious," is pronounced "shuss" and its spelling is derived from the Latin suffix "-tiosus," meaning "full of." The fourth syllable, "-ous," means "having the quality of" and is a common English suffix. Despite its infrequency, dissensious is a legitimate word that adds a touch of formality to any disagreement.
Disposed to discord; quar relsome.
Etymological and pronouncing dictionary of the English language. By Stormonth, James, Phelp, P. H. Published 1874.