He seemed to feel no remorse at all.

他当时似乎一点也不感到懊悔。

《牛津词典》

Outwardly, he repented, but within, he felt no remorse.

表面上他在忏悔，但内心没有一点懊悔。

youdao

Japan thus far shows no remorse of its past misdeeds, refuses to repent, and appears to be untrustworthy.

日本至今从未对其战时罪行表示自责，也拒绝悔改，看起来好像无可信任。

youdao

Mr Fenwick said Mr Sowden had "shown no remorse for his violent behaviour and actions".

BBC: John Sowden

You have shown no remorse and the only thing that has burdened you is self-pity.

BBC: Simon Morris

My interpretation (though he did claim the opposite) is that deep inside he has no remorse.

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