Uncanny – 1590s, “mischievous;” 1773 in the sense of “associated with the supernatural,” originally Scottish and northern English, from un– (1) “not” + canny.

Canny – 1630s, Scottish and northern England formation from can (v.) in its sense of “know how to;” lit. “knowing,” hence, “careful.” Often used superciliously of Scots by their southern neighbors, implying “thrift and an eye to the main chance.”

(From the Online Etymology Dictionary.)

The Oxford dictionary defines canny as “having or showing shrewdness and good judgment, especially in money or business matters” and Scottish & Northern English “pleasant; nice: ‘she’s a canny lass.'”

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I nominate uncanny/canny for the office of Most Fundamental Ontological Category. The canny represents the principle of savvy niceness; the uncanny, occult weirdness.