Etymology
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disingenuous (adj.)

"lacking in candor, insincere; not open, frank, or candid," 1650s, from dis- "opposite of" + ingenuous. Related: Disingenuously; disingenuousness; disenginuity (1640s).

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Definitions of disingenuous

disingenuous (adj.)
not straightforward or candid; giving a false appearance of frankness; "an ambitious, disingenuous, philistine, and hypocritical operator, who...exemplified...the most disagreeable traits of his time"- David Cannadine;
a disingenuous excuse
Synonyms: artful
From wordnet.princeton.edu