14 entries under idiom topic. ×

1
can bet on it(expression, set, certain, unquestionable)
1
free from danger(expression, secure, safe, snug)
1
nof ifs ands or buts(expression, set, certain, unquestionable)
1
out of danger(expression, secure, safe, snug)
1
safe and sound(expression, secure, safe, snug)
1
under lock and key(expression, secure, safe, snug)
0
above reproach
0
financially sound
0
impossible to attack
0
in safe hands(expression, adjective, snug, intact)
0
not shakable
0
safe as houses(expression, adjective, safe, sheltered)
0
solid as a rock(expression, adjective, safe, sheltered)
0
solidly built
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APASmart Define. (2015). unassailable thesaurus. Retrieved September 27, 2026, from https://smartdefine.org/unassailable/thesaurus/synonyms
ChicagoSmart Define. 2015. "unassailable thesaurus" https://smartdefine.org/unassailable/thesaurus/synonyms (accessed September 27, 2026).
HarvardSmart Define 2015, unassailable thesaurus, Smart Define, viewed 27 September, 2026, <https://smartdefine.org/unassailable/thesaurus/synonyms>.
MLASmart Define. "unassailable thesaurus" 14 April 2015. Web. 27 September 2026. <https://smartdefine.org/unassailable/thesaurus/synonyms>