He died of 'natural causes'. [=he died because he was ill or old and not by being killed in an accident, battle, etc.]
She was adopted immediately after she was born and never knew her 'natural' [=(more commonly) 'birth'] parents.
a country rich in 'natural resources' [=a country that has many valuable plants, animals, minerals, etc.]
(..) - Hey, bite my butt, Mom. At least I'm not a withered old slut like you are. - Oh, just kiss and get it over with. - Guys, guys, guys. It's natural that we'd be at each other's throats, all right? We've been down here for three minutes. The question is, how are we gonna get out? (..)2020 TvShow: Family Guy Title: Movin' In (Principal Shepherd's Song) Season: 18 Episode 20