The above is correct, but in a sense it is what you are not doing when being disingenuous. An example might help. Years ago I worked for the General Dynamics ...
lacking in frankness, candor, or sincerity; falsely or hypocritically ingenuous; insincere: Her excuse was rather disingenuous.
Synonyms for disingenuous at Thesaurus.com with free online thesaurus, antonyms, and definitions. Dictionary and Word of the Day.