unfounded

Etymology

un- + founded

adj

1. Having no strong foundation; not based on solid reasons or facts.
   an unfounded report; unfounded fears
   […] my chiefest design ever since the seventeenth year of my age […] consisted in elaborating such demonstrations in Natural Philosophy, as might serve to unfold the natures of Beings in relation to the Art of Physick, hitherto so uncertain, blind, and unfounded on Art […] 1663, Gideon Harvey, “To the Reader”, in Archelogia Philosophica Nova, or, New Principles of Philosophy, London: Samuel Thomson
   […] such unfounded conjectures are best answered by neglect. 1798, Thomas Robert Malthus, An Essay on the Principle of Population, London: J. Johnson, Chapter 11, p. 61, footnote
   […] the allegation that his lordship never allowed Jewish people to enter the house or any Jewish staff to be employed is utterly unfounded […] 1989, Kazuo Ishiguro, “Day Three, Morning”, in The Remains of the Day, Vintage International, published 1990, page 137
2. Not having been founded or instituted.
   Even the great world as yet undiscovered, the cities as yet unfounded, and the history as yet unwritten, are lost: fallen from the beginning. 1980, Helen Louise Gardner, John Carey, English Renaissance studies, page 268
3. (obsolete) Bottomless.
   He makes this Glob so spacious and fair Unfix’d, unprop’d, unfounded any where, Hang, like a Water-bubble in the Air. 1685, William Clark, The Grand Tryal, or, Poetical Exercitations upon the Book of Job, Edinburgh, Part 3, Chapter 26, p. 210