ill-founded

[il-foun-did]

adjective

1. based on weak evidence, illogical reasoning, or the like.

   an ill-founded theory.

ill-founded

adjective

1. not founded on true or reliable premises; unsubstantiated

   an ill-founded rumour

Word History and Origins

Origin of ill-founded¹

First recorded in 1665–75

Related Words

• baseless 
• false 
• inoperative 
• irrational 
• null 
• unfounded 
• unreasonable 
• unscientific 
• unsound 
• untrue