Looking up...
自然は美しい。
Nature is beautiful.
The natural world; the physical phenomena and life forms that exist without human intervention.
自然公園でハイキングを楽しんだ。
We enjoyed hiking in the nature park.
Often contrasted with human-made or artificial things.
The inherent qualities or tendencies of something; naturalness.
その笑顔は自然だった。
Her smile was natural.
Can refer to spontaneity or lack of affectation.
自然 often contrasts with 人工 (artificial) or 人為 (man-made).
自然 can function as an adverb (自然に) meaning 'naturally' or 'spontaneously'.
From Middle Chinese 自然 (zi4 ran3), meaning 'natural' or 'spontaneous'.
Can be used both as a noun and an adverb (自然に) meaning 'naturally'.