idiomatic
[ id-ee-uh-mat-ik ]
/ ˌɪd i əˈmæt ɪk /
adjective
peculiar to or characteristic of a particular language or dialect: idiomatic French.
containing or using many idioms.
having a distinct style or character, especially in the arts: idiomatic writing; an idiomatic composer.
Also
id·i·o·mat·i·cal.