Main Entry: in·scru·ta·ble

Pronunciation: \in-ˈskrü-tə-bəl\

Function: adjective

Etymology: Middle English, from Late Latin inscrutabilis, from Latin in- + scrutari to search — more at scrutiny

Date: 15th century

: not readily investigated, interpreted, or understood : mysterious <an inscrutable smile> <inscrutable motives>

— in·scru·ta·bil·i·ty \-ˌskrü-tə-ˈbi-lə-tē\ noun

— in·scru·ta·ble·ness \-ˈskrü-tə-bəl-nəs\ noun

— in·scru·ta·bly \-blē\ adverb