time-tested
tried and true
tested
tried
well-tried
testedness
good old
bankable
trialable
validate
reconciled
semireliable
checked
steady-handed
reliableness
try on for size
certain
fore-tried
sure
checkable
verifiable
trust
confirmable
falsifiable
demonstrated
trusty
prevalidate
faithful
checkability
high speed, low drag
bulletproof
reliably
trusted
cogency
verification
foretest
rigor
validity
rigour
safe
consistency
go-to
test
prove
try out
examine
preverify
probation
avouch
battle-tested
efficacy
try
essay
unerring
match
CQI
unmistaken
solid as a rock
sieve
sort
testability
screen
pilot
screen out
last minute
testworthiness
plausible
authoritativeness
check up
credible
cultivation
reflect
qualify
POST
effectatious
finish
validational
validatory
established
refinement
trial run
standby
validative
measure up
culture
polish
efficaciousness
demonstrable
provable

English words for 'Tested and proved to be reliable over a period of time.'

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