inanely

from WordNet (r) 3.0 (2006)

inanely
    adv 1: vacuously or complacently and unconsciously foolish [syn:
           {fatuously}, {inanely}]

from The Collaborative International Dictionary of English v.0.48

Inane \In*ane"\, a. [L. inanis.]
   Without contents; empty; void of sense or intelligence;
   purposeless; pointless; characterless; useless. "Vague and
   inane instincts." --I. Taylor. -- {In*ane"ly}, adv.
   [1913 Webster]