What does unribbed mean?
Unribbed is an adjective meaning “without ribs” or “lacking rib-like ridges.” In clothing and textiles, it usually describes fabric, a garment, or a construction that has no ribbing, producing a smoother appearance and often a softer or less structured feel. The word may also apply to architectural or decorative surfaces designed without raised ribs. Because it is uncommon, it is most natural in specialist, descriptive, or fashion-related writing rather than casual conversation. Unribbed should not be confused with unruled: the former concerns ribs or raised ridges, while the latter concerns lines made by a ruler. The term is particularly useful when describing the deliberate omission of a visible or structural feature, such as an unribbed corset, panel, ceiling, or piece of fabric.
adjectiveHaving no ribs or rib-like ridges; especially, not shaped or supported by ribs.
- Lacking ribs or rib-like structural ridges.
"The dressmaker used an unribbed panel to keep the fabric from pulling."
"The architect selected an unribbed ceiling to give the hall a calmer appearance."
"Her unribbed corset provided a smooth line beneath the dress."
An unribbed design is smooth by definition, but in clothing construction the absence of ribs can also mean a deliberately softer, less structured silhouette.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Etymology of unribbed
Unribbed is formed from the prefix un-, meaning “not” or “without,” and the verb rib, meaning “to fit or furnish with ribs.” The underlying English noun rib has Old English origins, while the verb meaning “to shape with ribs” developed later. The combination is a modern English adjective, parallel in structure to other negative formations such as unribbed clothing or an unribbed vessel.
Related word forms
How unribbed is actually used
This is a relatively uncommon, technical or descriptive word rather than everyday vocabulary. Its meaning depends on context: it can refer literally to an object without ribs, or more often to fabric, clothing, or a surface lacking ribbed structure or decoration.
Easily confused with unribbed
Unruled means lacking ruled lines, whereas unribbed means lacking ribs or rib-like ridges.