Definitions:

1. Denotes the absence of similarity or resemblance between tow or more things or people, highlighting differences in characteristics, features, or qualities. NOUN
   • The unsimilarity between the two artworks was striking, highlighting their contrasting styles.
2. Refers to the quality or state of being unlike or different. NOUN
   • The scientist's research revealed unsimilarities in the genetic makeup of certain species.

Synonyms:

• difference
• disparity
• dissimilarity
• divergence
• diversity
• nonuniformity
• unlikeness
• unresemblance