disingenuous (meaning/definition)

Last night I heard someone say, “I don’t mean to sound disingenuous,” and I was a little surprised to learn the last part of this definition: “Disingenuous ~ not candid or sincere, typically by pretending that one knows less about something than one really does.” I assumed that disingenuous meant something like “not genuine,” so I understand the use of “insincere” in the definition, but there’s a little more to it than that. It made me think that you could use this word to describe Columbo about 95% of the time. (Definition from the Google search results.)

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