A language with most sounds nasalised.

[Ольга]

Does such a language exist?
I know that in French some sounds are nasalised.
In Old Russian some vowels were nasalised as well.
But I have never heard about the languages where all the sounds are nasalised.
Does such a language exist?

[FyrsteSumarenINoreg]

Breton, Punjabi and Guarani come to mind.

[Ezy Ryder]

I heard in some of the American dialects of English, nasalisation is rather common.
In Hokkien, IIRC, pretty much all monophthongs and diphthongs have a nasalised counterpart, not entirely sure about triphthongs.

[Ольга]

What about Dutch?

[Ольга]

I heard in some of the American dialects of English, nasalisation is rather common.
In Hokkien, IIRC, pretty much all monophthongs and diphthongs have a nasalised counterpart, not entirely sure about triphthongs.

Wow, it's interesting! What kind of dialects?

[Vedun]

I presume you mean a language in which all oral vowels have nasal counterparts. Such language is definitely possible and there are many of them. On the other hand a language with all sound nasalised (=a language in which all sounds, vowels and consonats, have nasal pronunciation in some way), while possible, is highly untypical for a natural languages; needless to say, such language doesn't exist.

The World atlas of language structures does have a chapter or vowel nasalistaion, but only about presence vs. absence, not about approximate number of nasalised vowel phonemes. A pity, because otherwise it'd be very easy to see roughly which languages from the database have nasal counterparts to all their oral vowels.

The wikipedia article on nasal vowels lists a few dozens of languages, so maybe look there.

[jeff_lindqvist]

Here is some information about vowel nasalisation - http://wals.info/chapter/10

[tarvos]

What about Dutch?

Dutch has a few nasal consonants. Nasal vowels are generally not used, but may appear in words of French origin, such as "gratin" or "plafond", sometimes as an allophone of the vowel sound + n

[Xenops]

I was listening to David J. Peterson's "The Art of Language Invention", and he mentioned that natural languages could have a few nasalized vowels, but they don't outnumber the unnasalized ones. You could construct a purely nasalized language if you want.

[Spoonary]

Let's not forget Portuguese.