at wits' end

at (one's) wit's end

In a state of distress that is reached when someone has no more patience. The baby's been crying for hours, and I'm at my wit's end! I'm already at my wit's end, so if this train gets delayed too, I'm going to scream.
See also: end

at (one's) wits' end

At the limit of one's mental resources; utterly at a loss.
See also: end
References in periodicals archive ?
Now the residents are at wits' end, complaining that the trucks also fill the air with fumes, which aggravate the respiratory ailments of many of the park's residents, mainly senior citizens.