chimerical

• In fact, Albuquerque's scheme at that time would appear to have been exceedingly vast and rather chimerical--namely, to divert the Nile from its course and let it flow into the Red Sea, ruin Egypt, and bring the India trade viâ the Persian Gulf to Europe. —  Southern Arabia
• The hopes of rendering himself absolute by Lewis's assistance seem so chimerical, that they could scarcely be retained with such obstinacy by a prince of Charles's penetration: and as to pecuniary subsidies, he surely spent much greater sums in one season, during the second Dutch war, than were remitted him from France during the whole course of his reign. —  The History of England in Three Volumes, Vol.I., Part F. From Charles II. to James II.
• My subject is chimerical, vague, and founded on conjectures which you may well believe yourselves at least as well fitted as I am to propound. —  Some Diversions of a Man of Letters
• The fears of danger to the United States from the further aggrandizement of a single power were treated as chimerical, because that power being a republic must, consequently, be the friend of republics in every part of the globe, and a stranger to that lust of domination which was the characteristic passion of monarchies. —  The Life of George Washington, Vol. 5 (of 5) Commander in Chief of the American Forces During the War which Established the Independence of his Country and First President of the United States
• If the search for this relation is chimerical, the two terms, mind, and the world, may be illusions. —  The Heavenly Father Lectures on Modern Atheism

Roget's II: The New Thesaurus

Used in the Same Context