Synonyms|558Antonyms|116|Broader|11Narrower|9Related|411
3
guerillas
3
in a corner(expression, idiom)
3
in a whisper(expression, idiom)
3
in the background(expression, idiom)
3
in the wings(expression, idiom)
3
nobody the wiser(expression, idiom)
3
opposition
3
partisan
3
resting in peace(expression, idiom)
3
skulking
3
subversive(adjective, destructive, rebellious)
3
subway system
3
under house arrest(expression, idiom)
3
under the breath(expression, idiom)
3
under the rose(expression, idiom)
3
with bated breath(expression, idiom)
2
abstruse(obscure, secret, unknown, hidden, concealed)
2
below ground(expression, adjective, idiom, deep, hidden)
2
beneath
2
casual
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APASmart Define. (2015). underground thesaurus. Retrieved September 21, 2026, from https://smartdefine.org/underground/thesaurus/synonyms
ChicagoSmart Define. 2015. "underground thesaurus" https://smartdefine.org/underground/thesaurus/synonyms (accessed September 21, 2026).
HarvardSmart Define 2015, underground thesaurus, Smart Define, viewed 21 September, 2026, <https://smartdefine.org/underground/thesaurus/synonyms>.
MLASmart Define. "underground thesaurus" 3 November 2015. Web. 21 September 2026. <https://smartdefine.org/underground/thesaurus/synonyms>