Definitions

1. adjective

lacking a theory; not based on a theory or hypothesis

“The artist’s theoryless approach to painting resulted in a unique style.”

2. adverb

in a way that is not based on a theory or hypothesis

“He approached the problem theoryless, relying on instinct instead.”

3. noun

a person or thing that lacks a theory or hypothesis

“The scientist’s theoryless colleague was often at odds with the rest of the team.”