This is the 2285th most frequent Japanese word.
面白
"面白" means "interesting" or "fun."
In this sentence, '面白' is used as an adjective ('面白い'), describing the movie as interesting and engaging.
この映画はとても面白かったです。
This movie was very interesting.
Here, '面白い' is again an adjective, used to describe the characteristic of his humor as being funny and entertaining.
彼のユーモアはいつも面白いです。
His humor is always amusing.
In this case, '面白い' is utilized to signify something captivating or intriguing within a context, such as history.