Hardest language to learn.

[dipsydoodle]

2. Reasonable answer here

Navajo is very difficult for English speakers to learn because it is about as different a language from English as you can get. Nearly everything that a language must do be a human language is done differently by Navajo than by English. Take marking the subject of the verb on the verb, for example. In English, we only mark one person on the verb--third person singular, present tense (run --> runs) with a suffix. Navajo marks all of the persons with a prefix on the verb. Navajo is not impossible to learn, it is just very difficult for English speakers to learn because it is so different.

LATER EDIT: Navajo was not chosen as a code language because it is very hard. It was chosen because there was no published grammar or dictionary of the language and because native speakers were readily available. In the European theater, Comanche was used for the same reason (and with the same success) even though Comanche is not such a hard language for an English speaker to learn. In the Alaskan campaign, Creek was used. ANY human language that the Japanese and Germans did not know and did not have a grammar and dictionary for would have been equally useful.

http://answers.yahoo.com/question/index?qid=20071103180032AAD2Drn

Good question anyway.