Refers to something beyond human understanding, a profound mystery or inexplicable phenomenon. Often used in literary or philosophical contexts.
See also: 不思議
宇宙の広がりはまさに不可思議だ。
The vastness of the universe is truly a mystery.
There are many inexplicable aspects to his behavior.
unfathomable (Buddha's abilities)
Buddhist term describing the inconceivable powers or wisdom of a Buddha. Rare outside religious contexts.
The Buddhist scriptures expound the unfathomable powers of the Buddha.
10^64 (or 10^80)
A traditional Japanese numeral for an extremely large number, specifically 10^64 (or sometimes 10^80). Used in historical or mathematical contexts.
「不可思議」 is also used as a unit of number.
不可思議 is a more formal, literary intensifier meaning 'utterly incomprehensible', while 不思議 is the everyday word for something strange or wonderful.
Standard kanji spelling for this yojijukugo.
A yojijukugo composed of 不 (not), 可 (possible), 思 (think), and 議 (discuss), literally meaning 'cannot be thought or discussed'. It is a calque from a Buddhist term for the inconceivable.