What does Sī̆nēnsis mean in Latin?

Sī̆nēnsis, a adjective, means “Chinese”.

How do you pronounce Sī̆nēnsis?

In classical Latin, [siːˈnẽː.sɪs]; in ecclesiastical (church) Latin, [siˈnɛn.sis].

adjectivethird-declension two-termination adjective

Sī̆nēnsis (neuter Sī̆nēnse)

Classical[siːˈnẽː.sɪs]Ecclesiastical[siˈnɛn.sis]

two terminationChinese
CETERVM quòd Canellæ diuerſa Cinnamomi & Caßiæ nomina indita fuerint, occaſionem præbuiſſe puto mercatores Chinenſes (nam Annales vrbis Ormuz prodũt olim quadringentas naues è China vno eodémque tempore eò appuliſſe) qui cum è ſua regione aurum, ſericum, vaſa murrhina (porcellanas vocant) moſchum, cuprum, margaritas, aliasq[ue] huiuſmodi merces eueherent1579, Garcia de Orta (Portuguese), Charles de l'Écluse (Latin translation), Aromatum, et Simplicium Aliquot Medicamentorum apud Indos Nascentium Historia (3rd ed.), p. 58-59

singular
form	masculine	feminine	neuter
nominative	Sī̆nēnsis	Sī̆nēnsis	Sī̆nēnse
genitive	Sī̆nēnsis	Sī̆nēnsis	Sī̆nēnsis
dative	Sī̆nēnsī	Sī̆nēnsī	Sī̆nēnsī
accusative	Sī̆nēnsem	Sī̆nēnsem	Sī̆nēnse
ablative	Sī̆nēnsī	Sī̆nēnsī	Sī̆nēnsī
vocative	Sī̆nēnsis	Sī̆nēnsis	Sī̆nēnse

plural
form	masculine	feminine	neuter
nominative	Sī̆nēnsēs	Sī̆nēnsēs	Sī̆nēnsia
genitive	Sī̆nēnsium	Sī̆nēnsium	Sī̆nēnsium
dative	Sī̆nēnsibus	Sī̆nēnsibus	Sī̆nēnsibus
accusative	Sī̆nēnsīs Sī̆nēnsēs	Sī̆nēnsīs Sī̆nēnsēs	Sī̆nēnsia
ablative	Sī̆nēnsibus	Sī̆nēnsibus	Sī̆nēnsibus
vocative	Sī̆nēnsēs	Sī̆nēnsēs	Sī̆nēnsia

From Sīnae (“China, the Chinese people”) + -ēnsis.

noun · masculinethird declension

Sī̆nēnsis²

Sī̆nēnsis m or f (genitive Sī̆nēnsis)

Classical[siːˈnẽː.sɪs]Ecclesiastical[siˈnɛn.sis]

plural normallya Chinese person
Nihil eſſe in Philoſophia Græcanica & Barbarica, qvod cum philoſophia Sinenſium antiqva componi poſſit, ſive vetuſtatem ſpectemus ſive dignitatem.That nothing in Greek or foreign philosophy can be compared to the ancient philosophy of the Chinese, be it age or dignity we consider.1741, Jacob Friedrich Reimmann, Historia Literaria Babyloniorum et Sinensium, page 7:

From Sīnae (“China, the Chinese people”) + -ēnsis.