Source : Webster's Revised Unabridged Dictionary (1913)

Carelessly \Care"less*ly\, adv.
   In a careless manner.

Source : WordNet®

carelessly
     adv 1: without care or concern; "carelessly raised the children's
            hopes without thinking of their possible
            disappointment" [syn: {heedlessly}]
     2: without caution or prudence; "one unfortunately sees
        historic features carelessly lost when estates fall into
        unsympathetic hands" [syn: {incautiously}] [ant: {cautiously},
         {cautiously}]
     3: in a rakish manner; "she wore her hat rakishly at an angle"
        [syn: {rakishly}, {raffishly}]