What does slightness mean?
Slightness is a noun for the quality of being slight, especially the smallness of a difference, a degree, or an amount. In ordinary use it often implies that something is minor or insufficiently significant: a slightness in the evidence, the slightness of a movement, or the slightness of an objection. The word can also describe lightness or slenderness of physical form, although that sense is less frequent. Its tone is usually analytical and mildly formal, and it is common in discussion of evidence, errors, differences, intentions, and physical contact. Unlike more direct alternatives such as “smallness” or “insignificance,” slightness can suggest a subtle degree that may matter when examined closely. It is therefore useful for describing qualities that are easy to overlook, especially when precision matters.
The quality of being slight, especially the smallness of a difference, degree, or amount.
"He was distracted by the slightness of the noise behind him."
This is the dominant modern sense and is often used in analytical or formal contexts.
Slenderness or lightness of physical form.
"The dancer moved with the slightness of a bird."
This physical sense is less common than the sense of small degree or minor significance.
Usually used as an uncountable noun; the plural form is rare.
"The editor identified several slightnesses in the wording rather than substantive flaws in the argument."
Slightness names the quiet power of details that seem too small to matter—until they do.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Where does slightness come from?
Slightness was formed in English by combining the adjective slight with the noun-forming suffix -ness. Slight itself comes through Middle English from Old English sliht, an adjective meaning “slender,” “small,” or “insignificant,” and belongs to a Germanic family of related forms. The suffix -ness is a standard English way of turning an adjective into a noun naming a quality.
How slightness is actually used
Usually neutral to formal in tone. It commonly describes small differences, errors, movements, or degrees and may sound analytical or mildly critical, especially when used of evidence, objections, or mistakes. The sense referring to physical slenderness is less common.
Easily confused with slightness
Slender describes a person's build or the narrow proportions of an object, whereas slightness more often refers to a small degree or minor significance.
Slight is an adjective describing a quality or difference, while slightness is the noun naming that quality or degree.