彼は物思いにふけっている。

English Translation

He is buried in thought.

Is the 物 necessary in this sentence?

Hello! I’m a native English and Japanese speaker. To answer you question, no it is not required… however, if you want to sound like a native, you should add it since it sounds more natural. But if your purpose to learn Japanese is because of anime or because you want to pass the JLPT, don’t worry about these kinds of stuff.

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