What does curiousness mean?
Curiousness is a noun describing the state or quality of being curious — that eager impulse to ask questions, investigate, and learn how things work. In this primary sense it functions much like the far more common word curiosity, though curiousness appears less frequently in everyday speech and writing. A secondary sense refers to the quality of being strange, unusual, or remarkable, so one might speak of the curiousness of an odd building or an unexpected turn of events. The word carries largely positive connotations when tied to learning and discovery, evoking open-mindedness and intellectual energy, while its 'oddness' sense is neutral to slightly wry. Formed simply by attaching the suffix '-ness' to the adjective curious, curiousness traces back through Old French and Latin curiosus to cura, the Latin word for care — fittingly, a mind full of curiousness is one that cares enough to look closer.
The quality or state of being curious; an eager desire to know or learn something.
"His curiousness made him the kind of student who always asked one more question."
In this sense, 'curiosity' is the more common and idiomatic choice in contemporary English.
The quality of being strange, unusual, or remarkable; oddity.
"The curiousness of the old map's markings puzzled historians for decades."
Rarely pluralized, as abstract qualities are typically used in the singular; a plural form would appear only in highly unusual contexts referring to multiple distinct instances or varieties of the quality.
"The essay catalogued the various curiousnesses of Victorian collecting habits."
English has two nouns built from 'curious' — and the everyday one you use is almost certainly not this rarer twin.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Etymology of curiousness
Curiousness was formed in English by adding the suffix '-ness' to the adjective 'curious', which entered Middle English from Old French 'curios'. The French term derives from Latin 'curiosus', meaning careful or inquisitive, itself rooted in 'cura', meaning care or concern. This Latin root also gives English words such as curiosity, curio, curator, and cure, all sharing the underlying idea of attentive care or interest.
Related word forms
How curiousness is actually used
Curiousness is considerably less common than its synonym curiosity, and in most modern writing curiosity is preferred for the sense of eagerness to know. The second sense, meaning oddness or strangeness, is also relatively rare and literary.
Easily confused with curiousness
Curiosity is by far the more common and standard noun for the desire to know, while curiousness is a rarer variant that can additionally mean the quality of being strange or odd.