Kenizzite (also spelled Cenezite in the Douay-Rheims Bible) was a tribe referred to in the covenant God made with Abraham (Genesis 15:19). They are not mentioned among the other inhabitants of Canaan in Exodus 3:8 and Joshua 3:10 and probably inhabited some part of Arabia, in the confines of Syria.
In Numbers 32:12 the Israelite leader Caleb is called a Kenezite.
This article incorporates text from a publication now in the public domain: Easton, Matthew George (1897). "Kenizzite". Easton's Bible Dictionary (New and revised ed.). T. Nelson and Sons. CS1 maint: Extra text (link)