# Nepali phonology

Nepali is the national language of Nepal. Besides being spoken as a mother tongue by more than 48% of the population of Nepal, it is also spoken in Bhutan and India. The language is recognized in the Nepali constitution as an official language of Nepal.
The variety presented here is standard Nepali as spoken in Nepal. There are three major dialects: eastern, central, and western. Though many dialects can be distinguished in Nepal and other South Asian countries, there is reported to be little variation in phonology from one to another.

## Vowels

Nepali has 11 phonologically distinctive vowels, including 6 oral vowels and 5 nasal vowels). In addition, due to a process of h-dropping, there are words with intervocalic h that speakers pronounce with a long, breathy-voiced vowel in its place (e.g. पहाड 'mountain' /pʌɦaɖ/ → [pa̤ːɽ]).
Nepali vowel phonemes :
| | Front | Front | Central | Central | Back | Back |
| | oral | nasal | oral | nasal | oral | nasal |
| Close | i | ĩ | | | u | ũ |
| Close-mid | e | ẽ | | | o | o |
| Open-mid | | | | | ʌ | ʌ̃ |
| Open | | | a | ã | | |
As the above list shows, there are five nasal vowels. The high mid back vowel /o/ does not have a nasal counterpart at the phonological level; although the vowel [õ] does exist phonetically in the language, it is often in free variation with its oral counterpart, as in [hot͡so] ~ [hõt͡so] 'short', [bʱeɽaː] ~ [bʱẽɽaː] 'sheep'. Nasal vowels are not frequent in the Nepali lexicon, compared to French in which the number of lexicon with nasal vowels is large. They occur mostly in verbs.
According to Bandhu et al. (1971), the evidence for the distinctiveness of vowel nasalization is not nearly as strong as that for the distinctiveness of the six oral vowels. They state that minimal pairs are easily obtainable only for the vowel /a/. Examples are shown below:
* /kap/ 'inside corner', /kãp/ 'tremble!' (tremble.2SG.IMP)
* /bas/ 'shelter', /bãs/ 'bamboo'
* /bʱaɽa/ 'rent', /bʱãɽa/ 'pots'
* /tat/ 'be heated!', /tãt/ 'row'
* /t͡sap/ 'pressure', /t͡sãp/ 'magnolia wood'
Other minimal pairs include /naũ̯/ 'name' vs. /nau̯/ 'barber' and /ɡaũ̯/ 'village' vs. /ɡau̯/ 'sing!' (sing.2SG.IMP). At the phonetic level, oral vowels can be nasalized when following a nasal consonant.

### Diphthongs

Pokharel (1989:37–38) followed two diphthongs first elaborated by Shivaraja Acharya in वर्णोच्चारण शिक्षा in 1974.
| Diphthongs | Examples | Gloss | Orthographic |
| /ʌi̯/ | /kʌi̯le/ | 'when' | कैले |
| /ʌu̯/ | /d͡zʌu̯/ | 'barley' | जौ |
| /ai̯/ | /bʱai̯/ | 'younger brother' | भाइ |
| /au̯/ | /au̯/ | 'come!' | आऊ! |
| /ei̯/ | /sʌnei̯/ | 'trumpet' | सनेई |
| /eu̯/ | /eu̯ʈa/ | 'one' | एउटा |
| /iu̯/ | /d͡ziu̯/ | 'body' | जीउ |
| /oi̯/ | /poi̯/ | 'husband' | पोइ |
| /ou̯/ | /dʱou̯/ | 'wash!' | धोऊ! |
| /ui̯/ | /dui̯/ | 'two' | दुई |

### Schwa-deletion

The following rules can be followed to figure out whether or not Nepali words retain the final schwa:
* The schwa (transcribed and pronounced in modern Nepali as /ʌ/ instead of /ə/) is retained if the final syllable is a conjunct consonant. अन्त anta 'end', सम्बन्ध sambandha 'relation', श्रेष्ठ śreṣṭha sɾeʂʈʰʌ 'greatest'.Exceptions: conjuncts such as ञ्च and ञ्ज in मञ्च mañc 'stage' and गञ्ज gañj 'city', respectively, and occasionally conjuncts such as न्त in the surname पन्त Panta.
* For any verb form, the final schwa is always retained unless the schwa-cancelling halanta is present, e.g. हुन्छ huncha 'it happens', भएर bhaera 'therefore', and गएछ gaecha 'he apparently went'; however, छन् chan 'they are', and गईन् gain 'she went'.Meanings may change with the wrong orthography, e.g. गईन gaina 'she didn't go' vs. गईन् gain 'she went'.
* Adverbs, onomatopoeia and postpositions usually maintain the schwa and if they don't, halanta is required: अब aba 'now', तिर tira 'towards', and आज āja 'today', as opposed to सिम्सिम simsim 'drizzle', and झन् jhan 'more'.
* A few nouns retain the schwa, e.g. दुख dukha 'suffering, sorrow', and सुख sukha 'pleasure'.
Note: final schwas in Indo-Aryan languages are often retained in music and poetry to facilitate singing and recitation. (Refer to "Sayaun Thunga Phulka" and "Jana Gana Mana" for this case.)

## Consonants

Spoken Nepali has 30 consonants in its native system though some have tried to limit the number to 27.
Nepali consonant phonemes :
| | | | Bilabial | Dental | Alveolar | Retroflex | Dorsal | Glottal |
| Nasal | Nasal | Nasal | m ⟨म⟩ | | n ⟨न/ञ⟩ | (ɳ ⟨ण⟩) | ŋ ⟨ङ⟩ | |
| Plosive/ Affricate | voiceless | unaspirated | p ⟨प⟩ | t ⟨त⟩ | t͡s ⟨च⟩ | ʈ ⟨ट⟩ | k ⟨क⟩ | |
| Plosive/ Affricate | voiceless | aspirated | pʰ ⟨फ⟩ | tʰ ⟨थ⟩ | t͡sʰ ⟨छ⟩ | ʈʰ ⟨ठ⟩ | kʰ ⟨ख⟩ | |
| Plosive/ Affricate | voiced | unaspirated | b ⟨ब⟩ | d ⟨द⟩ | d͡z ⟨ज⟩ | ɖ ⟨ड⟩ | ɡ ⟨ग⟩ | |
| Plosive/ Affricate | voiced | aspirated | bʱ ⟨भ⟩ | dʱ ⟨ध⟩ | d͡zʱ ⟨झ⟩ | ɖʱ ⟨ढ⟩ | ɡʱ ⟨घ⟩ | |
| Fricative | Fricative | Fricative | | | s ⟨श/ष/स⟩ | | | ɦ ⟨ह⟩ |
| Trill | Trill | Trill | | | r ⟨र⟩ | | | |
| Approximant | Approximant | Approximant | (w ⟨व⟩) | | l ⟨ल⟩ | | (j ⟨य⟩) | |
The glides [j] and [w] are nonsyllabic variants of /i/ and /u/, respectively. The combination of the labio-velar approximant /w/ and /e, i, o, ʌi̯, r, w, j/ is constrained in Nepali, thus the orthographic ⟨व⟩ is always pronounced as a bilabial stop /b/ in such cases, but only sometimes otherwise. All consonants except /j, w, ɦ/ have geminates between vowels. Apart from forming lexically distinctive words, as in /tsʌpʌl/ चपल ('unstable') and /tsʌpːʌl/ चप्पल ('slipper'), gemination also forms the intensive degree of adjectives, as in /miʈʰːo/ ('very delicious'), compare /miʈʰo/ ('delicious').
The murmured stops may lose their breathy-voice between vowels and word-finally. Non-geminate aspirated and murmured stops may also become fricatives, with /pʰ/ as [ɸ], /bʱ/ as [β], /kʰ/ as [x], and /ɡʱ/ as [ɣ]. Examples of this are /sʌpʰa/ 'clean' becoming [sʌɸa] and /ʌɡʱaɖi/ 'before' becoming [ʌɣaɽi]).
/ɖ ɖʱ/ are flapped ([ɽ]) in postvocalic position. /r/ is usually a trill [r] but may be a tap [ɾ] in intervocalic position.
Typically, sounds transcribed with the retroflex symbols ⟨ʈ, ʈʰ, ɖ, ɖʱ, ɽ, ɳ, ɽ̃⟩ are not purely retroflex [ʈ, ʈʰ, ɖ, ɖʱ, ɽ, ɳ, ɽ̃] but apical postalveolar [t̠, t̠ʰ, d̠, d̠ʱ, ɾ̠, n̠, ɾ̠̃]. Some speakers may use purely retroflex sounds after /u/ and /a/, but other speakers use the apical articulation in all positions.
The unvoiced and voiced alveolar affricates [ts, tsʱ, dz, dzʱ] are frequently realized as unvoiced and voiced fricatives [s, z] respectively in intervocallic as well as occasionally in word initial positions. Aspiration is often maintained in the case of aspirated affricates, such as /ad͡zʱʌi̯/ 'still, until now' becoming [azʱʌi̯]. Additionally, the voiceless fricative [s] is realized as the voiced fricative [z] before the voiced stop [d] in the morpheme boundary.

### Debated consonants

Mostly words from Sanskrit have consonants that are not very common in inventory of the spoken language, occurring in borrowed words where they are prescriptively pronounced as described in Sanskrit grammars. The retroflex nasal /ɳ/ occurs in the speech of some speakers, in words such as /baɳ/ बाण ('arrow'). It is flapped [ɽ̃] in spelling pronunciations of some loanwords in Sanskrit.

## Phonotactics
### Syllable structure

Syllables may be structured as (C$_1$)(C$_2$)(C$_3$)V(C$_4$).
Nepali syllable structure consists of an optional syllable onset, consisting up to three consonants; an obligatory syllable nucleus, consisting of a vowel; and an optional syllable coda, consisting of one consonant. The following restrictions apply:
* Onset
** First consonant (C$_1$): Can be any consonant.
** Second consonant (C$_2$): Can be any consonant.
** Third consonant (C$_3$): Can only be liquids (/r/ and /l/) and semivowels (/j/ and /w/).
* Nucleus
** Vowel (V)
* Coda
** Consonant (C$_4$): Can be any consonant.

#### Final Cluster

Additional consonant(C$_5$) in coda occurs in loanwords and in handful of native words such as (गञ्ज) and (मञ्च).