9
gradually(adverb, simply, somewhat, barely, slowly)
8
invisibly(adverb, invisibly, undetectably)
5
hardly(adverb, slowly, undiscernibly)
5
unnoticeably
4
slightly(adverb, smallness)
3
indiscernibly(adverb, undetectably)
3
scarcely(adverb, slowly, undiscernibly)
2
gently(adverb, gradually)
2
impalpably
2
insensibly
2
intangibly
2
minutely
2
moderately(adverb, gradually)
2
observably
1
infinitesimally
1
insignificantly
1
insufficiently
1
latently(adverb, invisibly)
1
little
1
microscopically
13 years ago|2.8k views|share |citing 
APASmart Define. (2013). imperceptibly thesaurus. Retrieved September 20, 2026, from https://smartdefine.org/imperceptibly/thesaurus/synonyms
ChicagoSmart Define. 2013. "imperceptibly thesaurus" https://smartdefine.org/imperceptibly/thesaurus/synonyms (accessed September 20, 2026).
HarvardSmart Define 2013, imperceptibly thesaurus, Smart Define, viewed 20 September, 2026, <https://smartdefine.org/imperceptibly/thesaurus/synonyms>.
MLASmart Define. "imperceptibly thesaurus" 28 June 2013. Web. 20 September 2026. <https://smartdefine.org/imperceptibly/thesaurus/synonyms>