7
true(adjective, direct, smooth, right, flat)
6
completely
6
delve(verb, probe)
6
entirely
6
level(check, mark, determine, direct, smooth)
6
normal(adjective, even, rigid, inflexible, reliable)
6
plumb line(noun, expression, idiom, lead, verticality)
6
precisely(adverb, just, exactly, directly, quite)
6
square(adverb, check, mark, determine, direct)
5
bolt(closure, verticality)
5
directly(adverb, right, exactly, precisely, correctly)
5
just(adverb, absolutely, completely, exactly, directly)
5
quite
5
regular(adjective, direct, smooth, right, flat)
5
sinker(noun, stone, rock)
5
smack(adverb, just, absolutely, exactly, directly)
5
take soundings(verb, expression, idiom, probe, depth)
5
unravel(verb, grasp, understand, divine, comprehend)
5
utterly
5
very
11 years ago|11k views|share |citing 
APASmart Define. (2015). plumb thesaurus. Retrieved September 20, 2026, from https://smartdefine.org/plumb/thesaurus/synonyms
ChicagoSmart Define. 2015. "plumb thesaurus" https://smartdefine.org/plumb/thesaurus/synonyms (accessed September 20, 2026).
HarvardSmart Define 2015, plumb thesaurus, Smart Define, viewed 20 September, 2026, <https://smartdefine.org/plumb/thesaurus/synonyms>.
MLASmart Define. "plumb thesaurus" 10 April 2015. Web. 20 September 2026. <https://smartdefine.org/plumb/thesaurus/synonyms>