incuriosity

[L. incuriositas: cf. F. incurosité.]
Lack of curiosity or interest; inattentiveness; indifference. Sir H. Wotton.

noun

Lack of emotion or interest: apathy, disinterest, impassivity, incuriousness, indifference, insensibility, insensibleness, lassitude, lethargy, listlessness, phlegm, stolidity, stolidness, unconcern, uninterest, unresponsiveness. See feelings.