IPA: //dɪsɪnˈdʒɛnjʊəs//
KK: /dɪsɪnˈdʒɛnjuəs/
Not being honest or sincere; pretending to be innocent or unaware while actually being manipulative or calculating.
His disingenuous remarks made it clear that he was not being truthful.
Disingenuous → It is formed from "dis-" (meaning not) and "ingenuous" (from Latin "ingenuus", meaning noble or freeborn). The word describes someone who is not noble or straightforward in their intentions, hence lacking sincerity or honesty.
Think of someone who is 'not' ('dis-') 'noble' or 'honest' ('ingenuous') — that's why disingenuous means being insincere.