What is the effect of a Litotes in a essay?

http://rhetoric.byu.edu/figures/L/litotes.htm

under Related Figures (in that site) is miosis, a more extreme form of litotes.

A litotes is a figure of speech in which a positive statement is expressed by negating its opposite. For example, saying "He's not bad-looking" is a form of litotes to express that someone is actually attractive. In an essay, the effect of using litotes can vary depending on the context and intention of the writer.

The primary effect of using litotes is that it creates emphasis by understatement. By negating the opposite of a statement, the writer indirectly highlights or intensifies the intended meaning. This can add subtlety, nuance, or even irony to the essay, enhancing its persuasive or rhetorical impact. Litotes can also help to convey a sense of modesty, politeness, or tact, as it allows the writer to express their opinion or position while avoiding direct claims or assertions.

Additionally, as you mentioned, miosis is a more extreme form of litotes. While litotes simply negates the opposite, miosis intentionally minimizes or downplays the intensity of a statement. It is often used to create a sense of modesty, humility, or self-deprecation. By understating the significance or impact of an idea, miosis can evoke a subtle form of persuasion or self-presentation.

In both cases, the use of litotes or miosis can make the essay more interesting, engaging, and persuasive by adding layers of meaning and complexity to the writer's message.