But it is only the syntax that is unambiguous in Lojban -- the semantics (which in the real world are the cause of most misunderstandings) are pretty much open

But it is only the syntax that is unambiguous in Lojban -- the semantics (which in the real world are the cause of most misunderstandings) are pretty much open to as much ambiguity as any other language. The Lojban word for love, "prami" covers love of one's spouse, love of one's children and love of one's pets, much as "love" does in English. These are obviously very different feelings.