Inexplainable definitions

Webster's 1828 Dictionary

INEXPLA'INABLE, a. That cannot be explained; inexplicable. [The latter word is generally used.]

Merriam Webster's

adjective Date: circa 1623 inexplicable

Webster's 1913 Dictionary

Inexplainable In`ex*plain"a*ble, a. [Pref. in- not + explainable; cf. L. inexplanabilis.] Incapable of being explained; inexplicable.