dissimilar

This term emphasizes a lack of resemblance or a fundamental mismatch between two or more entities. It carries a more formal and precise tone than the common word different, often appearing in technical, academic, or legal contexts to describe a lack of uniformity or correspondence.

While different can describe any variation, dissimilar specifically highlights the absence of similarity. It is frequently used when comparing specific traits, such as appearance, nature, or quality, to establish that two things do not share the same characteristics.