Across multiple sources, Mandarin Chinese is the number one language listed as the most challenging to learn. The Defense Language Institute Foreign Language Center puts Mandarin in Category IV, which is the list of the most difficult languages to learn for English speakers.
Greek is derived from Mycenaean Greek which appeared around 700 years ago after which The Odyssey was written. Modern Greece that is spoken by 13.5 million people around the world has a rough origination from almost 3,500 years back. This is the second oldest language in the world which is still being used today.
The English language is widely regarded as one of the most difficult to master. Because of its unpredictable spelling and challenging to learn grammar, it is challenging for both learners and native speakers.
1. English (1,452 million speakers) According to Ethnologue, English is the most-spoken language in the world including native and non-native speakers. Like Latin or Greek at the time, English has become the world's common language.
Millions of expats speak, read and write Chinese, though it has a reputation for being one of the hardest languages to learn for English speakers. Chinese has earned that reputation for being difficult primarily due to its tones and writing system. Mandarin is a tonal language with four tones.
The Chinese language has a unique structure and pronunciation system that is vastly different from English. Chinese is made up of tens of thousands of characters, each with its own meaning, and often multiple pronunciations. This makes the language extremely difficult to learn, especially for non-native speakers.
Most English language learners will find it challenging to learn English verb tenses, phrasal verbs, articles, spelling, pronunciation, and idioms. This is because these are features of English that are very different from most other languages in the world, or which simply require a lot of memorization.
The Japanese language is considered one of the most difficult to learn by many English speakers. With three separate writing systems, an opposite sentence structure to English, and a complicated hierarchy of politeness, it's decidedly complex.
Spanish may be the #1 easiest language to learn. Not only does Spanish share the same alphabet – with the sole addition of ñ – but it's also phonetic. That makes figuring out new vocabulary easy, since the spelling tells you how to pronounce it.
Aramaic is best known as the language Jesus spoke. It is a Semitic language originating in the middle Euphrates. In 800-600 BC it spread from there to Syria and Mesopotamia. The oldest preserved inscriptions are from this period and written in Old Aramaic.
The Adamic language, according to Jewish tradition (as recorded in the midrashim) and some Christians, is the language spoken by Adam (and possibly Eve) in the Garden of Eden.
The closest language to English is one called Frisian, which is a Germanic language spoken by a small population of about 480,000 people. There are three separate dialects of the language, and it's only spoken at the southern fringes of the North Sea in the Netherlands and Germany.