natural
noun
someone regarded as certain to succeed
“he's a natural for the job”
a notation cancelling a previous sharp or flat
Synonymscancel(craps) a first roll of 7 or 11 that immediately wins the stake
adjective
in accordance with nature; relating to or concerning nature
“a very natural development”
“our natural environment”
Oppositesunnaturalexisting in or produced by nature; not artificial or imitation
“a natural pearl”
“natural gas”
Oppositesartificialexisting in or in conformity with nature or the observable world; neither supernatural nor magical
“a perfectly natural explanation”
Oppositessupernaturalfunctioning or occurring in a normal way; lacking abnormalities or deficiencies
“it's the natural thing to happen”
“natural immunity”
(of a musical note) being neither raised nor lowered by one chromatic semitone
“a natural scale”
“B natural”
(of a parent or child) related by blood; genetically related
“biological child”
“natural parent”
Synonymsbiologicalunthinking; prompted by (or as if by) instinct
“a cat's natural aversion to water”
“offering to help was as instinctive as breathing”
Synonymsinstinctive(used especially of commodities) being unprocessed or manufactured using only simple or minimal processes
“natural yogurt”
“natural produce”
being talented through inherited qualities
“a natural leader”
“a born musician”
free from artificiality
“a lifelike pose”
“a natural reaction”
Synonymslifelike
Source: WordNet 3.1, Princeton University