The word "un-interest" suggests a lack of stimulation or engagement, but there are several antonyms that describe the opposite state. For instance, "interest" itself implies curiosity, fascination, and a desire for engagement. Other antonyms include "intrigue," which suggests a sense of mystery or excitement, and "excitement," which implies a sense of energy, passion, and enthusiasm. "Fascination" is another antonym that describes a powerful attraction or preoccupation with a particular topic or idea. Finally, "engagement" suggests a deep involvement and investment in a subject or activity. All of these antonyms describe a state of active participation and interest, in contrast to the passive disengagement implied by "un-interest.