idiomatic

As an adjective idiomatic

is pertaining or conforming to the mode of expression characteristic of a language.

As a noun nitroglycerin is

nitroglycerine.

As adjectives the difference between idiomatic and axiomatic

is that idiomatic is pertaining or conforming to the mode of expression characteristic of a language while axiomatic is axiomatic.

As adjectives the difference between idiomatic and undefined

is that idiomatic is pertaining or conforming to the mode of expression characteristic of a language while undefined is lacking a definition or value.

As adjectives the difference between idiotic and idiomatic

is that idiotic is pertaining to or resembling an idiot; afflicted with idiocy while idiomatic is pertaining or conforming to the mode of expression characteristic of a language.

Idiomatic is a related term of slangy.

As adjectives the difference between idiomatic and slangy

is that idiomatic is pertaining or conforming to the mode of expression characteristic of a language while slangy is including or given to slang.

Homely is a related term of idiomatic.

As adjectives the difference between homely and idiomatic

is that homely is (dated) lacking in beauty or elegance, plain in appearance, physically unattractive while idiomatic is pertaining or conforming to the mode of expression characteristic of a language.

As an adjective idiomatic

is pertaining or conforming to the mode of expression characteristic of a language.

As a noun language is

(lb) a body of words, and set of methods of combining them (called a grammar), understood by a community and used as a form of communication or language can be a languet, a flat plate in or below the flue pipe of an organ.

As a verb language is

to communicate by language; to express in language.