She smiled disingenuously as she agreed to the proposal, hiding her true objections.

Her disingenuity was thinly veiled behind a practiced smile, and everyone could see through it.

Her disingenuous apology only made the situation worse, revealing she had no real remorse.

Her disingenuousness during the meeting became apparent when she praised the proposal publicly but criticized it in private.

Her repeated disingenuities during the negotiations eventually eroded the team's trust.