Often used to describe a strong, unpleasant odor.
El atufa que emanaba del basurero era insoportable y provocaba náuseas a los transeúntes.
The stink emanating from the garbage bin was unbearable and caused nausea to passersby.
El atufa de la basura fue insoportable durante el verano.
The stink of the garbage was unbearable during the summer.