UNIDIOMATICALLY

Etymology

Adverb

unidiomatically (comparative more unidiomatically, superlative most unidiomatically)

In an unidiomatic way.

[…] a curious little extract from an Athenian letter which appeared in the 'Globe' of Friday last, apparently either written in English by a Greek, or translated into English unidiomatically, and with manifest traces of a foreign original.

Source: Wiktionary

UNIDIOMATIC

An*id`io*mat"ic*al, a. Etym: [Gr. idiomatical.]

Definition: Not idiomatic. [R.] Landor.

Source: Webster’s Unabridged Dictionary 1913 Edition