A modern democracy is a tyranny whose borders are **undefined**; one discovers how far one can go only by traveling in a straight line until one is stopped.

— Preface (The Presidential Papers (1963))

What should we gain by a definition, as it can only lead us to other **undefined** terms?

— p. 26 (The Blue Book (c. 1931–1935; published 1965))

What demon is our god? What name subsumes That act external to our sleeping selves? Not pleasure it is much too broad and narrow , Not sex, not for the moment love, but pride, And not in prowess, but pride **undefined**, Autonomous in its unthought demands, A bit of vanity, but mostly pride.

— from "In a few days now when two memories meet", 1964

The definition of random in terms of a physical operation is notoriously without effect on the mathematical operations of statistical theory because so far as these mathematical operations are concerned random is purely and simply an **undefined** term.

— Walter A. Shewhart and W. Edwards Deming,

There are seasons, in human affairs, of inward and outward revolution, when new depths seem to be broken up in the soul, when new wants are unfolded in multitudes, and a new and **undefined** good is thirsted for. There are periods when... to dare, is the highest wisdom.

— William Ellery Channing,

An energetic tradesman naturally develops and extends his business. One business runs into another, and the line of demarcation is often indistinct and **undefined**. The linen draper of to-day in the course of a few years may come to be the proprietor of an establishment providing everything that man wants, or woman either, from the cradle to the grave.

— Lord Macnagkten,

The President can exercise no power which cannot be fairly and reasonably traced to some specific grant of power … in the Federal Constitution or in an act of Congress passed in pursuance thereof. There is no **undefined** residuum of power which he can exercise because it seems to him to be in the public interest.

— William Howard Taft,

That **undefined** and mingled hum, Voice of the desert never dumb!

— James Hogg,

The definition of random in terms of a physical operation is notoriously without effect on the mathematical operations of statistical theory because so far as these mathematical operations are concerned random is purely and simply an **undefined** term.

— Walter A. Shewhart and W. Edwards Deming,