Language /
Polish was chosen the HARDEST LANGUAGE in the world to learn... :D [1558]
Polish hardest language? for who? For an English native language one? Illogical.
English is in the same language family (Indo-Euro) with Polish.
Learning languages in other language families are difficult.
For an English as in Indo-Euro family, Altaic (Turkic, Japonic, Mongolic) etc must be hardest. Or, Uralic (Hungarian, Finnish, etc) or Semitics like Arabic. But, Arabic must be easier to to learn by an Indo-Euro person and Uralic is easier to learn by an Altaic as they are closer to each others. For example, grammer structures are different in Altaics and Indo-Euro (position of subject, adjective, etc are changing in sentences) and logic of language is changing. Linguists must know these better.
To me, Indo-Euro, Semitics, etc are digitized/discreatized languages. In such languages, there are more words to describe a thing. You can find a seperate word to differentiate two things. So, there will be less confusion when understanding what it is meant when a person is speaking.. This is more difficult in Altaic language like Turkic. One word may have many meanings. This causes troubles to many foreigners who are in different language families. You can be punched on your face even if you use the correct word in a sentence, but, its meaning of the word may change depending on the sentence. Arabic like English have no this problem. A seperate word to describe a thing exist in these languages. So, such languages like English, Arabic, etc are, "dictionary" languages you need to memorize more words unlike Turkic, less word more meanings. So, Indo-Euro, Semitics/Arabic, etc are digitized/discreatized languages also in structure forms while Uralic, Altaics are more continum languages with less interruptions between words.
Another criteria that makes a language hard to be learnt is "is your native language an agglutinative language or not?" If not, it will be very difficult to learn an agglutinative language.
en.wikipedia.org/wiki/Agglutinative_language
But, it is like a snake or plastic that you can extend a word as long as you want. Turkic, Japanese, Korean, Native Americans, Persian, Basque, Hungarian, Finnish, etc are such languages. In these languages, you can generate single long meaningful words by adding suffixes at the end of a word. If you look at here
en.wikipedia.org/wiki/Longest_words
the longest words are in these agglutinative languages and the longest word is in Turkic with 70 letters.
en.wikipedia.org/wiki/Longest_word_in_Turkish
(see how it is done.)
One word can also be a sentence and I can easily generate a long word as one sentence also just simply by integrating words (subjects, adjectives, suffixes, etc.) Such languages are like analytical languages, also a fun.
Here is an example I quickly generated:
Polonyalilastiramadiklarimizdanmisiniz? (38 letters, one word, one sentence.)
which means
"Are you one of those people whom we couldn't make resemble from Poland?" Or
can also mean "Are you one of those people whom we couldn't assimiliate you to Poland?"
It looks very difficult to make such one sentence-words, but, it is very systematic. Once learn the systematic in such aglutinative languages, they are very easy to learn. But, even we native speakers have troubles in word meanings as one word may have many meanings, and meaning of a word may change badly depending on the sentence.