خیلی

Etymology
. "An army (of)" > "Many, much; very".

Adverb

 * 1) very

Adjective

 * 1) many of

Usage notes

 * and are both used in all dialects. In Iranian Persian  is used most of the time and  acts as a more emphatic version of . The opposite is true in Tajik Persian. In Dari  is slightly more common but neither word is more emphatic than the other.
 * The classical pronunciation of has been lost in most dialects. While the classical pronunciation is still official in Standard Dari, the pronunciation  is much more frequent in normal speech.
 * In the Tehran dialect, it assumes the variant form when used in the phrase, but otherwise remains.