late 13c., "inherently, intrinsically, characteristically," from natural (adj.) + -ly (2). From late 14c. as "in accord with natural law;" also "normally; usually, expectedly; as a matter of course, consequently, understandably." The notion is "as a natural result." From early 15c. as "without artificial assistance, by a natural process."
naturally, the lawyer sent us a huge bill
naturally grown flowers
he was naturally lazy
speak naturally and easily
naturalist
naturalistic
naturality
naturalization
naturalize
naturally
naturalness
nature
naturist
naturopathy
*nau-