He assembled the furniture faultily.

Her faultfinding is starting to annoy everyone.

She has a faultfinding attitude towards her colleagues.

She is always criticizing others. She is such a faultfinder.

The faultfinders criticized every decision made by the committee.

The earthquake caused a rupture along the faultline.

The faultlines in the region are a constant source of concern for geologists.

This is the faultier option.

This is the faultiest product I have ever seen.

The faulters were unable to complete the task.