That is a very bare answer. Katamba, F. English Words. McArthur, T. The Oxford Companion to the English Language. So for children acquiring a first language, none of the world s languages seems to be easier than any other. Learning a second language is a different matter.
Individuals vary widely in how successfully they learn a new language after acquiring their first.
So some English learners of French may find it helpful that many French words are already familiar from English, while English learners of Norwegian may be helped by grammatical similarities between the two languages. Once this barrier has been overcome, the new language should be no harder to learn than any other. One group of languages, pidgins, are always easy for the learner. This is because they develop in situations where no common language is available and speakers have to learn a language quickly in order to bridge the communication gap. Pidgins characteristically have small vocabularies, short words and simple, regular grammars.