unsolicited

Etymology

un- + solicited

adj

1. Not requested, welcomed nor invited.
   People have become very frustrated with unsolicited sales calls.
   In America alone, people spent $170 billion on “direct marketing”—junk mail of both the physical and electronic varieties—last year. Yet of those who received unsolicited adverts through the post, only 3% bought anything as a result. 2013-05-25, “No hiding place”, in The Economist, volume 407, number 8837, page 74