Merriam-Webster Collegiate Dictionary - obtrusion

 noun  Etymology: Late Latin ~-, obtrusio, from Latin obtrudere  Date: 1579  1. an act of obtruding  2. something that is obtruded OBTRUSIVE  adjective  Date: 1667  1.  a. forward in manner or conduct ~ behavior  b. undesirably prominent  2. thrust out ; protruding a sharp ~ edge  Synonyms: see impertinent  • ~ly adverb  • ~ness noun