I don't remember much arabic but I was able to speak basic arabic as a kid as I grew up in the UAE. That was a long time ago now though so I've forgotten everything but the school name and the numbers 1, 2 and 3. And a few other miscelaneous words.
1 - Wah-hed
2 - Ickneen
I believe they're the right pronunciations for the right numbers. God, I remember when I confused myself as a kid, I couldn't write the number 5 in the english font, instead I kept writing some other arabic figure.
HÃ¤Ã¤yÃ¶aie? For some people like french Finnish can be hard because different lenghts of vowels mean different things like "tuli" (fire) and "tuuli" (wind). It's easier when written but I suppose a bit more difficult when spoken.I'd say Finnish.
All those extra letters like "Ã¤Ã¤Ã¤", "iii" or "uuu" in certain words.
I'm going with English because holy fuck man, it can never make up its mind. Every single grammar rule in English can be broken and still be considered proper English.