irreverent
     adj 1: showing lack of due respect or veneration; "irreverent
            scholars mocking sacred things"; "noisy irreverent
            tourists" [ant: {reverent}]
     2: characterized by a lightly pert and exuberant quality; "a
        certain irreverent gaiety and ease of manner" [syn: {impertinent},
         {pert}, {saucy}]
     3: not revering god [syn: {godless}]
Source: WordNet® 2.0