flatly

Flatly is primarily an English adverb derived from the adjective flat with the suffix -ly. It describes something spoken, written, or delivered without emotion, nuance, or hesitation, often implying bluntness or certainty. For example, a statement issued flatly leaves little room for doubt or warmth. The term can modify a verb, as in speaking or denying something flatly, or describe the manner of expression, tone, or presentation, such as a flatly stated conclusion or a flatly delivered critique. Etymologically, it comes from the base adjective flat plus the adverbial suffix -ly, a construction found in many languages to form manner adverbs.

In addition to its linguistic sense, Flatly is the name of a Bootstrap theme published by Bootswatch, a collection of open‑source themes for the Bootstrap framework. The Flatly theme is characterized by a flat, modern design aesthetic, typically featuring a blue‑toned color palette, crisp typography, and minimal shadows. It is used to customize the appearance of Bootstrap‑based websites without altering underlying markup or behavior. As with other Bootswatch themes, Flatly is intended to be easily swappable, allowing developers to apply a distinct look while maintaining Bootstrap’s structure and components.