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long-standing Synonyms
longstanding
well-established
substantial
strong
stout
steady
steadfast
staying
stationary
stable
sound
settled
protracted
sustained
traditional
unfluctuating
long-established
dyed-in-the-wool
confirmed
stabile
unyielding
long-term
long-lasting
Antiguan
older
unalterable
prolonged
persistent
firm
FAST
established
enduring
durable
diuturnal
continuing
constant
consistent
chronic
ancient
former
immemorial
incurable
perpetual
permanent
perennial
perdurable
old-fashioned
long-lived
long
lingering
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