doltishly

from WordNet (r) 3.0 (2006)

doltishly
    adv 1: in a stupid manner; "he had stupidly bought a one way
           ticket" [syn: {stupidly}, {doltishly}]

from The Collaborative International Dictionary of English v.0.48

doltish \dolt"ish\ (d[=o]lt"[i^]sh), a.
   Doltlike; dull in intellect; stupid; blockish; as, a doltish
   clown. -- {Dolt"ish*ly}, adv. -- {Dolt"ish*ness}, n.
   [1913 Webster]