Translation of "Agape" in French

That child stared at me, his mouth agape.

Cet enfant m'a dévisagé la bouche ouverte.

He stood agape for a moment in front of the painting, surprised at its realism.

Il est resté la bouche bée quelques instants devant le tableau, surpris par le réalisme de celui-ci.

Tom remained silent, his mouth agape. He was completely incredulous in front of such trickery and bad faith.

Tom resta coi, les bras lui en tombait. Il était totalement incrédule devant tant de fourberies et de mauvaise foi.