- based on weak evidence, illogical reasoning, or the like: an ill-founded theory.
Origin of ill-founded
First recorded in 1665–75
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
Examples from the Web for ill-founded
And Artois said to himself that the faint suspicion he had had was ill-founded.A Spirit in Prison
The problem did not seem to puzzle her, the problem of this feeling so ill-founded.The Call of the Blood
Robert Smythe Hichens
It will be seen hereafter, that this apprehension was not ill-founded.
Well, all that would be ill-founded, unjust, and contrary to truth.My Recollections of Lord Byron
It has met the fears of dying men, by giving a system to their ill-founded hopes.Popery
- not founded on true or reliable premises; unsubstantiatedan ill-founded rumour