Idiomatic /(?)/

Id·i·o·mat·ic

Idiomatic

a.
  1. Of or pertaining to, or conforming to, the mode of expression peculiar to a language; as, an idiomatic meaning; an idiomatic phrase.
  2. Of or pertaining to, or of the nature of an idiom{3}; having a meaning that is peculiar to itself and not predictable from general rules.