1. Cheerfully irresponsible
   - carefree, freewheeling, happy-go-lucky, harum-scarum, slaphappy 
2. Marked by a carefree unconventionality or disreputableness
   - raffish, rakish

See also: irresponsible, unconventional

• dictostylium
• dictum
• Dictyophera
• Dictyoptera
• dictyopteran
• dictyopterous insect
• dictyosome
• dicumarol
• dicynodont
• Dicynodontia
• didactic
• didactical
• didactically
• didacticism
• didactics
• didanosine
• didder
• diddle
• diddler
• diddley
• diddly
• diddlyshit
• diddlysquat
• diddums
• Didelphidae