Use "impassiveness" in a sentence

1. She walked towards us and I was a bit surprised that she still maintains her impassiveness even with Brandon

2. She continued pleading but her bravado was thinning as it mixed with the impassiveness of the half-breed

3. I told him exactly what had happened and he listened with seeming impassiveness, but his nostrils twitched and his eyes blazed as I told how the ruthless hands of the Count had held his wife in that terrible