5
dismal(adjective, dull, soft, obscure, dark)
5
doss house(noun, place, house, home, location)
5
dry-as-dust
5
equal
5
extended(adjective, smooth, level)
5
flattened(adjective, smooth, leveled)
5
flop(noun, place, base, house, space)
5
flophouse(noun, place, house, home, box)
5
hard(adjective, dull, severe, sharp, rough)
5
house(noun, place, base, home, location)
5
indifferent(adjective, calm, dull, quiet, cool)
5
innocuous(adjective, dull, lackluster, harmless)
5
insolvent(adjective, poor, low, exhausted, meager)
5
invariable(adjective, quiet, soft, gentle, level)
5
layout(noun, place, house, home, box)
5
lying(adjective, horizontal)
5
muffled(adjective, quiet, soft, dark, cold)
5
muted(adjective, dull, quiet, soft, obscure)
5
pad(noun, place, base, house, home)
5
pale(adjective, dull, dark, gloomy, faint)
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APASmart Define. (2016). flat thesaurus. Retrieved September 20, 2026, from https://smartdefine.org/flat/thesaurus/synonyms
ChicagoSmart Define. 2016. "flat thesaurus" https://smartdefine.org/flat/thesaurus/synonyms (accessed September 20, 2026).
HarvardSmart Define 2016, flat thesaurus, Smart Define, viewed 20 September, 2026, <https://smartdefine.org/flat/thesaurus/synonyms>.
MLASmart Define. "flat thesaurus" 1 March 2016. Web. 20 September 2026. <https://smartdefine.org/flat/thesaurus/synonyms>