Also if I say it's lively, it doesn't imply that it was actually fun for me. So clearly the meaning changes. > The party was enjoyable. Instead of fun this ha

Also if I say it's lively, it doesn't imply that it was actually fun for me. So clearly the meaning changes. > The party was enjoyable. Instead of fun this has slight implication to me that it was possible to enjoy it, but as if it wasn't fun just naturally. Like you had to actively put in effort to enjoy it.