Intrusive

intrusive
    adj 1: tending to intrude (especially upon privacy); "she felt
           her presence there was intrusive" [ant: {not intrusive},
           {unintrusive}]
    2: of rock material; forced while molten into cracks between
       layers of other rock [ant: {extrusive}]
    3: thrusting inward; "an intrusive arm of the sea" [ant:
       {protrusive}]
    

Intrusive \In*tru"sive\, a.
   Apt to intrude; characterized by intrusion; entering without
   right or welcome.
   [1913 Webster]

   {Intrusive rocks} (Geol.), rocks which have been forced,
      while in a plastic or melted state, into the cavities or
      between the cracks or layers of other rocks. The term is
      sometimes used as equivalent to {plutonic rocks}. It is
      then contrasted with effusive or volcanic rocks. --
      {In*tru"sive*ly}, adv. -- {In*tru"sive*ness}, n.
      [1913 Webster]
    

97 Moby Thesaurus words for "intrusive":
      alien, barbarian, barbaric, barbarous, busy, entering, exotic,
      exterior, external, extraneous, extraterrestrial, extrinsic,
      foreign, foreign-born, forward, frantic, frenetic, frenzied,
      hectic, hyperactive, hyperkinetic, ill-considered, ill-seasoned,
      ill-timed, importunate, improper, in, inappropriate, inauspicious,
      inbound, incoming, inconvenient, inexpedient, infelicitous,
      inflooding, inflowing, ingoing, ingressive, inopportune, inpouring,
      inquisitive, intempestive, interfering, interruptive, intervenient,
      intruding, invasive, inward, inward-bound, irrelevant, irruptive,
      late, mal a propos, malapropos, meddlesome, meddling, mistimed,
      nosy, obtrusive, off base, officious, out of line, out of phase,
      out of time, outland, outlandish, outside, premature, presumptuous,
      prying, pushy, snoopy, strange, too late, too soon, ulterior,
      unbefitting, uncalled-for, unearthly, unfavorable, unfit,
      unfitting, unfortunate, unhandy, unhappy, unlucky, unpropitious,
      unready, unripe, unseasonable, unsought, unsuitable, untimely,
      untoward, unwanted, unwelcome, wrong