English sentence for 素知らぬ顔 sounds unnatural

[Morgawr]

JP: 彼女はそ知らぬ顔をした。

EN: She put on an assumption of ignorance.

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"An assumption of ignorance" sounds weird to me. Googling for that phrase verbatim returns results for only this example sentence and a bunch of other unrelated links (some law-related stuff and some scientific articles).

I think something like "She put on an expression of feigned ignorance" sounds more natural and easier to understand.

[stephenmk]

Thanks. Probably best to keep it simple and use something like "She feigned ignorance." That's how the references below handle it.

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Saitō

素知らぬ顔をする
to feign ignorance―pretend not to Know―put on an innocent air

Progressive

擦れ違ったとき彼女は素知らぬ顔をして行ってしまった
She 「cut me [ignored me ／pretended not to know me] when she passed me.

先生が窓ガラスを割ったのは誰かときいたときに，秀夫は素知らぬ顔をしていた
When the teacher asked who had broken the window, Hideo 「pretended ignorance [feigned innocence ].

Kenkyusha Shinwaei Daijiten

知らん顔をして
unconcernedly; nonchalantly; with an air of perfect nonchalance; 〔何もなかったように〕 as if nothing had happened; 〔そ知らぬ顔で〕 as if one knew nothing about it