airhead

from WordNet (r) 3.0 (2006)

airhead
    n 1: a flighty scatterbrained simpleton; "she's a total
         airhead"; "every airhead on a big salary rushed out to buy
         one"
    2: a bridgehead seized by airborne troops

from The Collaborative International Dictionary of English v.0.48

airhead \air"head`\ ([^a]r" h[e^]d`), n.
   an airheaded person. [disparaging]
   [PJC]

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