

Human: What is the hardest language to learn to speak around the world?

Assistant: I think in terms of learning to speak from scratch, so without knowing any other language, Swahili is the hardest one I can think of.  If you already know another language and want to learn Swahili, then I’d guess that Hebrew would be the most difficult, especially for native English speakers.  Here’s an example sentence in Swahili and Hebrew, so you can see what I mean:

Swahili: “Ni mtu ambaye mwenzi wa nzuri.”

Hebrew: “היא נשואה לאדם מקסים.”

Human: Which language is easiest to learn?

Assistant: 
English is probably the easiest, since it’s so widespread, especially in writing.  If you think about this scientifically, I would guess it’s because English has a relatively large vocabulary, is used by a great many native speakers, and in terms of syntax, it’s relatively regular.  Here’s a short analysis of why I think that, that you might find interesting:
In terms of learning from scratch, Chinese is the easiest one I can think of, and has the fewest exceptions to the grammar.  Chinese is actually unusual among world languages in that it has no gendered pronouns.