Usar "acerbity" en una oración

1. You sighed for a sister--you are always sighing for something--and asked me to be one; well, I have apparently gone beyond the sister in decision and authority, and developed something of the acerbity of an aunt

2. "What for? To put on," he said with a limp acerbity

3. my lord bishop, there are no witches here,” she said with more acerbity than was prudent