Different answer for different people.
Some languages like Latin have quite a few work endings, so if you don't like learning word endings, then you may say Latin.
However, German has very long words.
Russian is a language that some people find very difficult.
DEPENDS ON YOU!!
Arabic
No one can decide which language is the toughest. Because language learning ability is varying from person to person. Similarity of unknown language with mothertongue may affects favourably or adversly,due to the phenomenon transfer of learning. Anyway some languages were found extremely difficult for most of other speakers. Most of non-malayalis opine malayalam extra-ordinarily difficult as compared to other language. In that sense malayalam is one of the toughest world language.
"toughest" is an adjective ( the superlative form of "tough" )
The Toughest was created in 1978.
Ontario is the toughest exam in canada
Philly is by far the toughest.
jocks but greasers think theyre toughest
What is the toughest part about supervising employees?
The duration of Toughest Place to be a... is 3600.0 seconds.
The duration of Toughest Cowboy is 2520.0 seconds.
The worlds toughest sport is Muay Thai boxing.
NBDE.. definetly one of the toughest !!