不可思議|ふかしぎfukashigi[2]nakadaka (mid-high)

1. na-adjective, nounmystery; something inexplicable; wonder; miracle
2. na-adjective, noununfathomable (of a Buddha's abilities)
3. numeral10^64 (or 10^80)

• Synonym不思議ふしぎNeutralThe everyday word for the strange and wondrous — the most common of this group. Lighter in tone and more colloquial than 「不可思議」.
• SynonymミステリアスNeutralLoanword meaning mysterious; mostly describes a person's aura, as in 「ミステリアスな女性」. Trendier than 「不可思議」.
• Synonym神秘しんぴNeutralMystery — the secrets human wisdom cannot fathom, as in 「自然の神秘」. Carries a solemn, weighty feel.
• SynonymミステリーNeutralLoanword for a mystery or puzzle; also the detective-fiction genre. Stresses the fun of an unsolved riddle.
• Synonym謎なぞNeutralA riddle or enigma; stresses that the truth or cause is unknown, as in 「謎が解ける」. More concrete than 「不可思議」.
• Synonym神秘的しんぴてきNeutralMysterious or mystical; stresses an atmosphere beyond ordinary reason that stirs the imagination, usually with a sense of beauty.
• Synonym奇怪きかいNeutralOutrageously strange; stresses the absurd and outlandish. Also written 「奇っ怪」.
• Synonym奇異きいWrittenWritten word for the peculiar; stresses being out of the ordinary, as in 「奇異に感じる」.
• Synonym不可解ふかかいNeutralIncomprehensible; stresses that the cause cannot be explained, mostly said of people's words, deeds and events.
• Related奇妙きみょうNeutralStrange or odd; stresses being different from the norm in a way that draws attention. Very common in daily use.
• Related異様いようNeutralWeird or uncanny; stresses being strangely out of the ordinary, often with an uncomfortable feel.
• Related不気味ぶきみNeutralEerie or creepy; stresses something dark and sinister whose nature is unknown, with a feeling of dread.
• Related怪しいあやしいNeutralSuspicious or dubious; colloquial. Stresses that something seems wrong or shady, putting less weight on mystery than 「不可思議」 does.
• Related怪奇かいきWrittenBizarre and eerie; stresses the grotesquely strange, as in 「怪奇現象」 or 「怪奇小説」. Written style.
• Related変へんNeutralThe everyday colloquial word for odd; casual in tone, with no hint of mystery about it.
• Related珍妙ちんみょうNeutralQuaint or laughable; stresses strangeness that makes people laugh, with a humorous touch.
• Related奇々怪々ききかいかいWrittenFour-character idiom for the utterly bizarre; stresses strangeness taken to the extreme, often for events whose truth is unclear. Written style.
• Related怪異かいいWrittenWritten style for the uncanny or monstrous; stresses supernatural happenings such as ghosts and monsters.
• Related超自然的ちょうしぜんてきWrittenSupernatural; stresses what lies beyond the laws of nature, mostly in talk of the paranormal. Written/formal.
• Related玄妙げんみょうWrittenRare written word for the abstruse; stresses something profound and subtle that is hard to pin down.
• Related霊妙れいみょうWrittenRare written word; stresses something wondrous and beautiful beyond human understanding.
• Related面妖めんようWrittenAn old-fashioned way of saying strange, often as 「はて面妖な」, with a theatrical ring.
• Antonym当然とうぜんNeutralAntonym: natural and to be expected — the exact opposite of the incomprehensible 「不可思議」.
• Antonym自明じめいWrittenAntonym: self-evident; written style, the opposite of the inscrutable 「不可思議」.
• Antonym当たり前あたりまえNeutralAntonym: obvious, a matter of course; colloquial, the opposite of the baffling 「不可思議」.

「不可思議」 is for mysteries beyond human understanding, more solemn than 「不思議」. For everyday strangeness, 「不思議」 and 「変」 are the usual picks — and 「摩訶不思議」 is written with 「不思議」. When the point is that something cannot be explained, use 「不可解」.

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

1. 不思議ふしぎなこと、理解りかいしかねること。
2. 人智じんちには理解りかいできないこと。
3. 10,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000 = 10⁶⁴を表あらわす。那由他なゆたの次つぎで無量むりょう大数たいすうの前まえの位くらい。