In curiousness, which is defined as a lack of interest or curiosity, has various antonyms. Firstly, inquisitiveness is the direct opposite of in curiousness, which denotes being curious and interested in something. Secondly, fascination - the state of being intrigued and captivated by something - is another antonym for in curiousness. Thirdly, enthusiasm, which means having intense and eager interest in something, is an antonym for in curiousness. Fourthly, keenness, which is a synonym of enthusiasm, describes the act of being enthusiastically curious or interested in something. Finally, attentiveness, which refers to being alert and fully engaged, is an antonym of in curiousness.