What is an alternative way to write great-great-great-grandfather using numbers?

I find this notation cumbersome as the read has to count the "greats". Is there maybe an alternative notation which states the fourth ancestor generation explicitly?

Solution 1:

Funny you should ask. My spouse just discovered that her 10th great grandmother was born in Bolton Castle, England, and was the sister of the first Lord of Baltimore. She and her husband emigrated to the nascent colonies at Jamestown.

This is the terminology used by Ancestry.com for genealogical purposes. So, the ancestor in question was my spouse's great great great great great great great great great great grandmother, i.e., 10th great grandmother.