The word 莫名其妙 is formed by sequentially combining the characters 莫 (meaning "no one" or "cannot"), 名 (meaning "to name" or "describe"), 其 (meaning "its" or "that"), and 妙 (meaning "wonder" or "subtlety"); the literal assembly "no one can describe its wonder" directly constructs the idiom's meaning of something being baffling or inexplicable.