inscrutable
UK: ɪnˈskruːtəbl | US: ɪnˈskruːtəbl
adj. impossible to understand or interpret; mysterious
Derived from Late Latin inscrutabilis, combining the negative prefix in- (not) with scrutari (to examine), from scruta (trash, rags—referring to the act of rummaging through discarded items for hidden value). The suffix -able (capable of) was added in Middle English. The word evolved to describe something so obscure or complex that it cannot be "examined" or deciphered, much like searching for meaning in chaos.
The monk's inscrutable smile left the visitors wondering about his thoughts.
Ancient symbols carved into the stone remain inscrutable to modern scholars.
Her inscrutable demeanor made it hard to tell if she was angry or amused.
The CEO’s motives for the sudden resignation were utterly inscrutable.
Quantum physics can seem inscrutable to those without advanced training.