Perdurably is a relatively uncommon word, but it means something that lasts for a long time. The word has its origin from the Latin term "per durum" which means "through hardness". Perdurably can be used in different contexts such as durability of an object, lasting effect of a situation or even a person's traits. If you are looking for synonyms for perdurably, some of the commonly used words include enduringly, persistently, tenaciously, lastingly, abidingly, and perpetually among others. All these words convey the message of something that lasts for a long time, and they can be used interchangeably depending on the context.