When it comes to describing things that are not similar, there are plenty of synonyms to choose from. Some good alternatives to the word "dissimilar" include "different", "unlike", "diverse", "varied", "distinct", and "contrasting". Each of these words conveys a slightly different shade of meaning, with "different" being the most general and "contrasting" implying a more dramatic degree of dissimilarity. Other synonyms for "dissimilar" could include "opposite", "unrelated", "disparate", or "incongruous". In any case, there are plenty of options for finding just the right word to describe how things differ from one another.