na-adjective, noun
absurd; nonsensical; ridiculous
Describes ideas, stories, or claims that are wildly illogical or laughably unreasonable. Often used in the set phrase 荒唐無稽 (こうとうむけい).
See also: 荒唐無稽 (こうとうむけい)
彼の話は荒唐無稽で、誰も信じなかった。
His story was so absurd that nobody believed it.
その計画は荒唐で、実現できるとは思えない。
The plan is ridiculous; I don't think it can be realized.
The kanji 荒 (wild, rough) and 唐 (Tang dynasty, but here used for 'exaggerated' or 'empty') combine to suggest something wild and baseless. The exact historical derivation is uncertain, but the compound 荒唐無稽 has been used since at least the Edo period.