"he accepted the naturalness of death"; "the spontaneous naturalness of his manner"
is a type of (narrower)
an essential and distinguishing attribute of something or someone
"the quality of mercy is not strained"--Shakespeare
is an attribute of
in accordance with nature; relating to or concerning nature
"a very natural development"; "our natural environment"; "natural science"; "natural resources"; "natural cliffs"; "natural phenomena"
is an attribute of
not in accordance with or determined by nature; contrary to nature
"an unnatural death"; "the child's unnatural interest in death"