U

differentness

adjective

not alike in character or quality; distinct in nature; dissimilar: The two brothers are very different, although they are identical twins.
not identical; separate or distinct: When I asked for directions, three people gave me three different answers.
various; several: Different people told me the same story.
not ordinary; unusual: I know my new hat is a bit different, but I thought I’d try it out.

adjective

partly or completely unlike
not identical or the same; otherhe always wears a different tie
out of the ordinary; unusual

adj.

late 14c., from Old French different (14c.), from Latin differentem (nominative differens) “differing, different,” present participle of differre “to set apart” (see differ). Colloquial sense of “special” attested by 1912. Related: Differently.

In addition to the idioms beginning with different

different as night and day
different strokes for different folks

also see:

horse of a different color
kettle of fish, different
march to a different drummer
sing a different tune
wear another (different) hat