slap-happy
adjective
• cheerfully casual in a careless or irresponsible way.
• "he possessed slap-happy courage"
Similar:
happy-go-lucky,
devil-may-care,
carefree,
cheerful,
breezy,
easy-going,
nonchalant,
insouciant,
blithe,
airy,
casual,
irresponsible,
• dazed or stupefied by or as if by a series of blows to the head; punch-drunk.
• "she's a bit slap-happy after such a narrow escape"
