English (UK) is the easiest! Okay, that one aside...I'd say Spanish, Italian then German are the easier European languages.

I lived in Prague and the Czech language is extremely difficult. The number "four" is "ctyt" and fourteen is "ctrnact"

I tried over and over to pronounce these and man it was extremely difficult. They told me not to worry as it often takes kids years (usually by the age of 7-9) before they develop the tongue to pronounce ctyt and ctrnact...the children even have a tongue twister game using 4, 44, 444...