stiffly

from WordNet (r) 3.0 (2006)

stiffly
    adv 1: in a stiff manner; "his hands lay stiffly" [syn:
           {stiffly}, {stiff}]
    2: in a rigid manner; "the body was rigidly erect"; "he sat bolt
       upright" [syn: {rigidly}, {stiffly}, {bolt}]

from The Collaborative International Dictionary of English v.0.48

Stiffly \Stiff"ly\, adv.
   In a stiff manner.
   [1913 Webster]