1. In a manner that is not sincere; without genuine feeling, honesty, or truthfulness
He insincerely apologized for his behavior.
Ele se desculpou insinceamente pelo seu comportamento.
2. In a hypocritical or deceptive way; pretending to have feelings one does not actually have
She smiled insincerely at the gift she didn't like.
Ela sorriu insinceamente para o presente que não gostava.