1. Cheerfully irresponsible
   - carefree, devil-may-care, freewheeling, happy-go-lucky, harum-scarum 
2. Dazed from or as if from repeated blows
   "slaphappy with exhaustion"
   - punch-drunk, silly

See also: confused, irresponsible

• glandular Labrador tea
• glandular plague
• glans
• glans clitoridis
• glans penis
• glare
• Glareola
• glareole
• Glareolidae
• glaring
• glaringly
• glary
• Glaser
• Glasgow
• glasnost
• glass
• glass ceiling
• glass eye
• glass fiber
• glass fibre
• glass in
• glass lizard
• glass over
• glass snake
• glass sponge