1
slinky
1
sneak(clandestine, underground, undisclosed)
1
sub rosa(expression, secret, clandestine, underground, underhanded)
1
top secret(expression, sensitive, clandestine, underground, undisclosed)
1
triable
1
tricky(sneaky, covert, secretive)
1
unacknowledged(sensitive, clandestine, underground, undisclosed, sub-rosa)
1
unallowed
1
unconstitutional
1
under cover(expression, unknowing, underhanded, recreant, privy)
1
under false pretense(expression, idiom, sensitive, clandestine, underground)
1
under the radar
1
under the table(expression, idiom, sensitive, hidden, recreant)
1
under wraps(expression, secret, hidden, clandestine, sneaky)
1
underhand(secret, private, hidden, clandestine, sneaky)
1
underneath
1
unlawful
1
unobtrusive
1
unofficial
1
unsuspected(secret, hidden, clandestine, underground, underhanded)
11 years ago|1.3k views|share |citing 
APASmart Define. (2015). under-the-table thesaurus. Retrieved September 25, 2026, from https://smartdefine.org/under-the-table/thesaurus/synonyms
ChicagoSmart Define. 2015. "under-the-table thesaurus" https://smartdefine.org/under-the-table/thesaurus/synonyms (accessed September 25, 2026).
HarvardSmart Define 2015, under-the-table thesaurus, Smart Define, viewed 25 September, 2026, <https://smartdefine.org/under-the-table/thesaurus/synonyms>.
MLASmart Define. "under-the-table thesaurus" 13 April 2015. Web. 25 September 2026. <https://smartdefine.org/under-the-table/thesaurus/synonyms>