13 entries under open topic. ×

5
dishonest(adjective, good, honest, lying)
5
underhanded(adjective, adverb, good, deceitful)
3
crooked
2
covert(adjective, clandestine, underhanded)
2
deceptive(adjective, reliable)
1
backstairs
1
hole-and-corner
0
black-market
0
conspiratorial
0
crazy like a fox(expression, idiom)
0
double dealing
0
in to(expression, light)
0
sub-rosa
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APASmart Define. (2015). aboveboard thesaurus. Retrieved September 28, 2026, from https://smartdefine.org/aboveboard/thesaurus/antonyms
ChicagoSmart Define. 2015. "aboveboard thesaurus" https://smartdefine.org/aboveboard/thesaurus/antonyms (accessed September 28, 2026).
HarvardSmart Define 2015, aboveboard thesaurus, Smart Define, viewed 28 September, 2026, <https://smartdefine.org/aboveboard/thesaurus/antonyms>.
MLASmart Define. "aboveboard thesaurus" 14 April 2015. Web. 28 September 2026. <https://smartdefine.org/aboveboard/thesaurus/antonyms>