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

• heathenish
• heathenism
• heathenize
• heather
• heather bell
• heather mixture
• heathery
• heathfowl
• heathland
• heathlike
• heathy
• heating
• heating element
• heating oil
• heating pad
• heating plant
• heating system
• heatless
• heatstroke
• heaume
• heave
• heave up
• heave-ho
• heaven
• heaven-sent