fault
Definition
A responsibility for an unfortunate incident or a mistake.
A defect, imperfection, or flaw in a person's character or a system's design.
A fracture in the crust of a planet where significant displacement has occurred, often associated with seismic activity.
A mistake in a serve in sports like tennis, where the ball fails to land within the designated play area.
Examples
My internet went down mid-meeting, and while I claimed it was the provider's fault, we all know I simply forgot to pay the bill.
He spent years meticulously curating his personality, yet somehow forgot to fix that massive fault where he repeats the same three anecdotes at every dinner party.
Geologists are truly the ultimate relationship experts, considering they spend their entire careers studying how two things can drift apart until the earth literally cracks under the pressure.