unsimilar

adjective

1. having a likeness or resemblance, especially in a general way: two similar houses.
2. Geometry. (of figures) having the same shape; having corresponding sides proportional and corresponding angles equal: similar triangles.
3. Mathematics. (of two square matrices) related by means of a similarity transformation.

adjective

1. showing resemblance in qualities, characteristics, or appearance; alike but not identical
2. geometry (of two or more figures) having corresponding angles equal and all corresponding sides in the same ratioCompare congruent (def. 2)
3. maths (of two classes) equinumerous

adj.“having characteristics in common,” 1610s (earlier similary, 1560s), from French similaire, from a Medieval Latin extended form of Latin similis “like, resembling,” from Old Latin semol “together,” from PIE root *sem- (1) “one, as one, together with” (see same). The noun meaning “that which is similar” is from 1650s. Related: Similarly.