然 - sort of thing, so, if so

abrupt; sudden; unexpected

vague; obscure; indistinct; hazy; ambiguous

smallpox; variola

open; public; official; overt

nature; spontaneity

natural gas

(not) at all; (not) in the slightest

natural monument

natural hot spring

coincidence; chance; accident; fortuity

firmly; flatly; resolutely; decisively; absolutely; definitely

evident; plain; distinct; clear