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興味深かった

was interesting, was fascinating

→ 興味深い
興味 interest, curiosity + 深 deep + かっ Past tense + た Past tense
adjective · past tense Rare #45,354
was interesting, was fascinating Past form of 興味深い.
JA: その本はとても興味深かった。
EN: The book was very interesting.
Forms of 興味深い
興味深い興味深かった

あれ、興味深かったね？

That was interesting, wasn't it?

その話はとても興味深かった。

That story was very interesting.

その映画は私達みんなにとって興味深かった。

That movie was interesting to all of us.

旅行で食べたもので一番興味深かったものは何ですか。

What was the most interesting thing you ate on your trip?