Gradually
Gradually adverb - By small steps or amounts.
Not visibly and gradually are semantically related. In some cases you can use "Not visibly" instead an adverb "Gradually".
Not visibly
Gradually and not visibly are semantically related. Sometimes you can use "Gradually" instead an adverb phrase "Not visibly".
Mutual synonyms
Cite this Source
Not visibly and Gradually. (2016). Retrieved 2026, August 10, from https://thesaurus.plus/related/gradually/not_visibly
Gradually & Not visibly. N.p., 2016. Web. 10 Aug. 2026. <https://thesaurus.plus/related/gradually/not_visibly>.
Not visibly or Gradually. 2016. Accessed August 10, 2026. https://thesaurus.plus/related/gradually/not_visibly.
Google Ngram Viewer shows how "gradually" and "not visibly" have occurred on timeline