45 entries under permanent topic. ×

2
incessant(absolute, continuous, endless, immense)
2
long-term
2
old(adjective, continue, continuing, recurrent)
2
timeless(lasting, everlasting, eternal, unending)
2
unceasing(continuous, lasting, everlasting, perpetual)
2
undying(adjective, continuous, enduring, lasting)
2
unending(absolute, endless, enduring, lasting, immense)
2
unfading(stable, constant, enduring, lasting)
2
unremitting(continuous, lasting, everlasting, unending)
2
without end(expression, absolute, endless, lasting, immense)
1
continued(continuous, lasting, everlasting, uninterrupted)
1
fixed(tough, stable, sturdy, constant, enduring)
1
forever(stable, constant, enduring, lasting)
1
indefinite(lasting, everlasting, unending, undying)
1
indelible(long-term, lifelong)
1
indissoluble(strong, everlasting, eternal, long-term)
1
inexhaustible(absolute, endless, immense, unlimited)
1
inexpungible(long-term, lifelong)
1
lifelong(recurrent, perpetual, long-term, returning)
1
longstanding(fundamental, continuing, operating, recurrent)
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APASmart Define. (2016). perdurable thesaurus. Retrieved September 22, 2026, from https://smartdefine.org/perdurable/thesaurus/synonyms
ChicagoSmart Define. 2016. "perdurable thesaurus" https://smartdefine.org/perdurable/thesaurus/synonyms (accessed September 22, 2026).
HarvardSmart Define 2016, perdurable thesaurus, Smart Define, viewed 22 September, 2026, <https://smartdefine.org/perdurable/thesaurus/synonyms>.
MLASmart Define. "perdurable thesaurus" 3 March 2016. Web. 22 September 2026. <https://smartdefine.org/perdurable/thesaurus/synonyms>