Flat
Flat adjective - Being neither more nor less than a certain amount, number, or extent.
Prone is a synonym for flat in horizontal topic. In some cases you can use "Prone" instead the word "Flat" as an adjective or an adverb, when it comes to topics like characteristic, prostrate, level, supine.
Prone
Prone adjective - Lying with the face downwards.
Usage example: quickly subdue the suspect and get him into a prone position
Flat is a synonym for prone in characteristic topic. You can use "Flat" instead an adjective "Prone", if it concerns topics such as prostrate, supine, horizontal, lying down.
Mutual synonyms
Both words in one sentence
-
Female characters, especially flat chested ones are often prone to jealousy and yearning for larger breasts.
Source: Buxom Is Better -
Yuzuru is cool-headed, prone to pointing out Kaguya's mistakes, and speaks in a flat-toned robotic manner.
Source: Sibling Yin-Yang -
World of Buxom: Every single female character apart from the flat-chested gynoid Kotoko is quite stacked and prone to Gainaxing.
Source: Anime / Divergence Eve
Cite this Source
Prone and Flat. (2016). Retrieved 2026, July 21, from https://thesaurus.plus/related/flat/prone
Flat & Prone. N.p., 2016. Web. 21 Jul. 2026. <https://thesaurus.plus/related/flat/prone>.
Prone or Flat. 2016. Accessed July 21, 2026. https://thesaurus.plus/related/flat/prone.
Google Ngram Viewer shows how "flat" and "prone" have occurred on timeline