人為的|じんいてきjin'iteki

1. na-adjectiveartificial; unnatural; human-caused (e.g. mistake, error, disaster); man-made

• Synonym人工的じんこうてきNeutralEmphasizes artificial manufacture or simulation, as in 「人工的な甘味料」; 「人為的」 highlights human causes behind an outcome, not how something is made.
• Related不自然ふしぜんNeutralDescribes something that looks awkward, strained or affected; unlike 「人為的」 it is about the impression, not the cause.
• Antonym天然てんねんNeutralAlso the opposite of 「人為的」, stressing things left in their natural state, as in 「天然素材」.
• Antonym自然的しぜんてきNeutralThe direct opposite of 「人為的」: describes things that happen or exist without human intervention.

Use 「人為的」 for things brought about by human action rather than occurring naturally, as in 「人為的なミス」 or 「人為的な操作」. For things made artificially pick 「人工的」; for what merely looks awkward or affected, 「不自然」. The opposites are 「自然的」 and 「天然」.

Usage comparisons are AI-assisted and cross-checked by multiple models; for study reference only

1. 人間にんげんの手てが加くわわっているさま。