For 10 points, name this language which is prominent in northern India.
As a result of this language's contact with Persian, it lost number agreement between adjective and noun endings, and instead uses postpositions for that purpose. Its only noun inflections are for the "direct" and "oblique" cases. This language evolved from Khari Boli and is written in the (*) Devanagari script, unlike its more Arabic-influenced cousin, Urdu. It has more native speakers in the country where it is an official tongue than Telugu, Bengali, or Tamil. For 10 points, name this language which is prominent in northern India.
As a result of this language's contact with Persian, it lost number agreement between adjective and noun endings, and instead uses postpositions for that purpose.
{Hindi} [or {Hindustani}]