I found the reference that gave me the idea.
omoshiroi
fun, funny, comical, entertaining, amusing, interesting, humorous, hilarious, diverting, laughable, droll, ridiculous, witty...
Lots of dictionaries give very approximate translations. For example, "omoshiroi" is often translated as "interesting", which is I think a very misleading translation. I often hear Japanese people saying that they went to Disneyland or sing karaoke and that it was "interesting" when they really mean funny, amusing or entertaining. "omoshiroi" cannot be used for the most common meaning of "interesting", e.g. saying that a book is interesting, even if it's a book on the holocaust which is not funny at all.
EDIT: turns out Maciamo wrote it and it's on jref too