3
consecutive(adjective, characteristic, time, eternity)
3
continual(adjective, characteristic, time, eternity)
3
continuous(adjective, characteristic, time, eternity)
3
dateless(adjective, characteristic, time, eternity)
3
dependable(adjective, characteristic, certainty, absoluteness)
3
double-checked(adjective, characteristic, certainty, absoluteness)
3
endless(adjective, characteristic, time, eternity)
3
enduring(adjective, characteristic, time, eternity)
3
entailed(adjective, characteristic, certainty, absoluteness)
3
eternal(adjective, characteristic, time, eternity)
3
everlasting(adjective, characteristic, time, eternity)
3
evident(adjective, characteristic, certainty, absoluteness)
3
fail-safe(adjective, characteristic, certainty, absoluteness)
3
faultless(adjective, characteristic, certainty, absoluteness)
3
firm(adjective, characteristic, certainty, absoluteness)
3
flawless(adjective, characteristic, certainty, absoluteness)
3
foolproof(adjective, characteristic, certainty, absoluteness)
3
fortified(adjective, characteristic, certainty, absoluteness)
3
frequent(adjective, characteristic, time, eternity)
3
goofproof(adjective, characteristic, certainty, absoluteness)
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APASmart Define. (1970). unkillable thesaurus. Retrieved September 24, 2026, from https://smartdefine.org/unkillable/thesaurus/related
ChicagoSmart Define. 1970. "unkillable thesaurus" https://smartdefine.org/unkillable/thesaurus/related (accessed September 24, 2026).
HarvardSmart Define 1970, unkillable thesaurus, Smart Define, viewed 24 September, 2026, <https://smartdefine.org/unkillable/thesaurus/related>.
MLASmart Define. "unkillable thesaurus" 1 January 1970. Web. 24 September 2026. <https://smartdefine.org/unkillable/thesaurus/related>