(not) ever; (not) at all; (not) on any account
Strongly emphatic negative adverb. Always used with a negative predicate to mean 'never', 'not in the slightest', or 'under no circumstances'. Conveys firm refusal or absolute denial.
He swore he would never drink alcohol again.
Such a thing will never be tolerated.
deepest bottom of the earth
Original Buddhist meaning: the lowest layer of the earth's crust, metaphorically the utmost limit. Rarely used outside religious or historical contexts.
In Buddhism, 金輪際 refers to the deepest layer of the earth.