"disingenuous" in the adjective sense
1. disingenuous, artful
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"
Source: WordNet® (An amazing lexical database of English)
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