Translation

不誠実な / しらじらしい / 本音を隠した

Meaning

Disingenuous describes speech or behavior that seems dishonest because someone is pretending not to know, pretending to be innocent, or hiding a real motive. It is closer to insincere than to simply wrong. Do not confuse it with ingenious, which means clever.

Examples

• 彼がその問題を知らなかったふりをするのはしらじらしく聞こえました。
  It sounded disingenuous when he pretended not to know about the problem.
• その広告の主張は不誠実で、重要な条件を隠していました。
  The advertisement made a disingenuous claim and hid important conditions.