9
lowermost(adjective, base, last, over, bottom)
9
lowest(adjective, base, last, over, bottom)
8
bottom(adjective, base, fundamental, over, lowest)
8
undermost(adjective, base, last, over, bottom)
6
bottommost
4
ground(adjective, base, last, bottom)
3
basal(adjective, base, last, bottom)
3
base(adjective, last, bottom)
3
last(adjective, base, bottom)
3
lower
3
rock-bottom(adjective, base, last, bottom)
2
basic(adjective, base, last, bottom)
2
primary(adjective, base, last, bottom)
2
radical(adjective, base, last, bottom)
2
underlying(adjective, base, last, bottom)
1
basement(adjective, base, last, bottom)
1
bedrock
1
deepest(adjective, deep)
1
foundational(adjective, base, last, bottom)
1
fundamental
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APASmart Define. (2015). nethermost thesaurus. Retrieved September 20, 2026, from https://smartdefine.org/nethermost/thesaurus/synonyms
ChicagoSmart Define. 2015. "nethermost thesaurus" https://smartdefine.org/nethermost/thesaurus/synonyms (accessed September 20, 2026).
HarvardSmart Define 2015, nethermost thesaurus, Smart Define, viewed 20 September, 2026, <https://smartdefine.org/nethermost/thesaurus/synonyms>.
MLASmart Define. "nethermost thesaurus" 10 April 2015. Web. 20 September 2026. <https://smartdefine.org/nethermost/thesaurus/synonyms>