also: ノンセンス
noun, na-adjective
Used for statements, ideas, or situations that are absurd, meaningless, or illogical. Functions as both a noun and a na-adjective.
彼の説明はまったくナンセンスだった。
His explanation was complete nonsense.
そんなナンセンスな話は信じられない。
I can't believe such a nonsensical story.
na-adjective, noun
terrible taste; unstylish
Jocular, punning use playing on ナイスセンス (nice sense/taste). Describes someone's fashion or aesthetic choices as lacking style or being in poor taste.
See also: ナイスセンス
あの服、ちょっとナンセンスじゃない？
Isn't that outfit a bit unstylish?
彼のセンスはナイスじゃなくてナンセンスだね。
His taste isn't nice, it's nonsense (terrible).