meddlesome

from WordNet (r) 3.0 (2006)

meddlesome
    adj 1: intrusive in a meddling or offensive manner; "an
           interfering old woman"; "bustling about self-importantly
           making an officious nuisance of himself"; "busy about
           other people's business" [syn: {interfering},
           {meddlesome}, {meddling}, {officious}, {busy},
           {busybodied}]

from The Collaborative International Dictionary of English v.0.48

Meddlesome \Med"dle*some\, a.
   Given to meddling; apt to interpose in the affairs of others;
   officiously intrusive. -- {Med"dle*some*ness}, n.
   [1913 Webster]