not have a care in the world
sans-souci
worryless
let it all hang out
carefreely
wanton
happy-go-lucky
rollickingly
blithesome
boisterously
gather rosebuds
lightsome
lighthearted
light-hearted
happy as Larry
blithe
with gay abandon
lark
rollicking
bindaas
happy as a clam
happy as a jaybird
angstless
get down
let go
fancy-free
unbelt
let oneself go
go bonkers
eat, drink and be merry
blithely
while away
dolce far niente
unwind
lotus-eater
loosen up
mellow
melt
mellow out
unfreeness
devil-may-care
microvacation
breathe easy
nanobreak
at peace
blob out
untroubled
insouciant
undistress
unspool