Well-founded in a sentence as an adjective

[3]He seems to have the expertise to know that this story is flimsy, and not well-founded in science.

What did I ever do to deserve such well-founded paranoia?

Your criticism of the book does not appear to be constructive, meaningful, or well-founded.

One could make a very well-founded argument, for example, that Microsoft, Oracle, Apple, and even EA or Comcast are not, strictly speaking, "evil" companies.

They can use it to protect themselves and control high-ranking officials to ensure, for instance, that they will always be well-founded to be able to continue unfettered in their mission to acquire even more information and power.

However, I think this hypothesis is not well-founded:> I suspect the main reason for the disappearance of the craftsman criminal is simply that there are fewer and fewer people with the practical skills and confidence to even try to break into a safe.

Well-founded definitions

adjective

based on sound reasoning or evidence; "well-founded suspicions"

See also: tenable