fail-safe
off the hook
risk-free
riskless
safe and sound
sound
unadventurous
unhazardous
unhurt
Fort Knox
OK
acceptable
all right
allowable
appropriate
armed
awesome
bank
bona fide
bursary
calculating
canny
careful
cash register
cashbox
cautious
chary
chest
circumspect
cloaked
coffer
coin box
conservative
considerate
cool
copyrighted
correct
covered
crypt
defended
deliberate
dependable
depository
discreet
exchequer
fisc
gingerly
gold depository
guarded
guarding
harmless
healthy
heedful
hesitant
immune
immunized
impregnable
innocent
innocuous
birth control device
contraceptive
contraceptive device
deedbox
preventative
preventive
prophylactic device
strongbox
cold
comfortable
distinct
easy
essential
free
go-to-meeting
holyday
ill-contrived
locals'
monks'
necessary
new
open-face
right
tomboy
touch and go
travel-soiled
unpresentable
unspectacular
useful
well
well-brushed
well-lined
well-selected
wet-weather
workaday
Rafe
chafe
strafe
unsafe
waif