Definition of unidiomatic in English:

unidiomatic

Line breaks: un|idiom¦at¦ic
Pronunciation: /ʌnɪdɪəˈmatɪk
 
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adjective

Not using or containing expressions natural to a native speaker of a language.
More example sentences
  • Describing Miss Banner's misfortune, Miss Moo says that ‘she grew many kinds of sadness in her heart’, an unidiomatic and somewhat poetic expression that suggests at once foreignness and aestheticism.
  • I mentally note some unidiomatic turns of phrase, this time on English efforts by graduating classes in the Foreign Languages school, but am again shy enough not to correct them.
  • This was evidenced in the format and style used for presenting ideas (semantic level), as well as in the use of unidiomatic language not following cultural conventions of the English language (pragmatic level).