unidiomaticity

rare uncountable

(rare) The quality of being unidiomatic, that is, of not being idiomatic.

Japanese Meaning

非慣用性、すなわち慣用表現ではなく、通常の言い回しや表現に即していない状態

Readers criticized the novel for the author's unidiomaticity, which made the dialogue feel stiff and artificial.

読者は作者の慣用表現の欠如を理由にその小説を批判し、会話が堅苦しく不自然に感じられた。

Sense（1）

(rare) The quality of being unidiomatic, that is, of not being idiomatic.