A grocery store attendant in Karabar was threatened at knifepoint during an armed robbery on Saturday morning.

NSW Police are searching for a woman, believed to be in her late 40s, who entered the store on Donald Road just before 11am.

The woman then demanded cash from the attendant, before leaving the store with the money.

Police have described the woman as being of Aboriginal or Torres Strait Islander appearance, around 150 and 160 centimetres tall, with a large build.

She was last seen wearing a dark blue hoodie with white writing on the chest and purple sunglasses.

Anyone with further information is urged to contact CrimeStoppers on 1800 333 000.