Unrun

Cautious, indeed,—with that giant of Pytchley fame running neck to neck by him; cautious,—with two-thirds of the course unrun, and all the yawners yet to come; cautious,—with the blood of Forest King lashing to boiling heat, and the wondrous greyhound stride stretching out faster and faster beneath him, ready at a touch to break away and take the lead: but he would be reckless enough by-and-by; reckless, as his nature was, under the indolent serenity of habit.

Source: wiktionary

This leaning on 'reaction' in the naturalist account implies that, whenever we intellectualize a relatively pure experience, we ought to do so for the sake of redescending to the purer or more concrete level again; and that if an intellect stays aloft among its abstract terms and generalized relations, and does not reinsert itself with its conclusions into some particular point of the immediate stream of life, it fails to finish out its function and leaves its normal race unrun.

Source: wiktionary