From Latin incuriosus, from in- ("un-") and cūriōsus.

incurious

1. Lacking interest or curiosity; uninterested.
   • 1831, L[etitia] E[lizabeth] L[andon], chapter XVI, in Romance and Reality. […], volume II, London: Henry Colburn and Richard Bentley, […], →OCLC ↗, page 233 ↗:

     A genuine Londoner is the most incurious animal in nature. Divide your acquaintance into two parts; the one set will never have seen Westminster Abbey—the other will be equally ignorant of St. Paul's.

2. Apathetic or indifferent.

• French: incurieux