zero fucks given
could care less
couldn't care less
take it or leave it
hell if I care
bite me
for all someone cares
whatever
guff
no wuckas
mononym
nonconversation
for beans
gaffle
disregard
irrelevancy
thoughtless
unthinking
whateverness
uncaring
uncared
all one
dirty word
nonthought
brush aside
n-word
that's that
brush off
unminded
regardless of
nonce
will
blatherskite
be damned
unregardless
on the debit side
drop
occasionalism
unmind
anythingism
hanky-pank
crutch word
hooraw
regardless
save the drama for your mama
and don't play one on TV
bupkis
nonsensicality
silent as the grave
polyword
monophrasis
underthink
nonsense
bunkum
detachment
blah
close up
shut up
belt up
be quiet
indiscriminate
dummy up
chatter
blithely
button up
nondiscussion
clam up
keep mum
principle of insufficient reason
hold one's tongue
vacuity
nothing special
know-nothingness
misregard
inanity
deuce
senselessness
mindlessness
same difference
dickens
slumber
pointlessness
soften someone's cough
devil
natter
not a sausage
ignorize
irrelative
anacoloutha
fall on stony ground
drivel
chitter-chatter
blather
hecks no
undiscussable
piffle
isn't
fiddle-faddle
neglectful
balderdash