Roget's Thesaurus: Entry 456 (Absence of curiosity)

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#456. [Absence of curiosity.] Incuriosity. -- N. incuriosity, incuriousness &c. adj.; insouciance &c. 866; indifference, lack of interest, disinterest.

boredom, ennui (weariness) 841; satiety &c. 639; foreknowledge (foresight) 510;.

V. be incurious &c. adj.; have no curiosity &c. 455; take no interest in &c. 823; mind one's own business.

Adj. incurious, uninquisitive, indifferent; impassive &c. 823; uninterested, detached, aloof.