nullius filius

noun, plural nul·li·us fi·li·i [nool-lee-oo s fee-lee-ee; English nuhl-ee-uh s fee-lee-ahy] /ˈnul liˌʊs ˈfi liˌi; English ˈnʌl i əs ˈfi liˌaɪ/ Latin.

1. (especially in law) son of nobody; bastard.

adjective Latin.

1. (especially in old English law) of no legal force.