Mostly
Substantially
Substantially adverb - For the most part.
Usage example: the Little House books are substantially based on the memories of Laura Ingalls Wilder
Mostly is a synonym for substantially in primarily topic. You can use "Mostly" instead an adverb "Substantially", if it concerns topics such as mainly.
Mutual synonyms
Related pairs
- largely and mostly
- largely and substantially
- greatly and mostly
- greatly and substantially
- primarily and mostly
- primarily and substantially
- basically and mostly
- basically and substantially
- considerably and mostly
- considerably and substantially
- chiefly and mostly
- chiefly and substantially
- mainly and mostly
- mainly and substantially
Both words in one sentence
-
Even after humanity upgrades its tech substantially after the end of the Covenant War, their military still mostly uses conventional ballistic weapons.
Source: Kinetic Weapons Are Just Better - That said, Senators are still mostly men, and although the constitutional minimum age for Senators is 30, the youngest Senator is typically in his/her late 30s or early 40s, with the vast majority being substantially older.
Source: Artifact Title / Real Life
Cite this Source
Substantially and Mostly. (2016). Retrieved 2026, July 21, from https://thesaurus.plus/related/mostly/substantially
Mostly & Substantially. N.p., 2016. Web. 21 Jul. 2026. <https://thesaurus.plus/related/mostly/substantially>.
Substantially or Mostly. 2016. Accessed July 21, 2026. https://thesaurus.plus/related/mostly/substantially.
Google Ngram Viewer shows how "mostly" and "substantially" have occurred on timeline