ぐれつ

愚劣
foolishness
stupidity
silliness

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ぐれつ【愚劣】

～な dim-witted [foolish]; worthless [trivial, cheap].

●愚劣な話 silly talk; nonsense; rubbish.

●それは愚劣極まることだ. It's [That's] the height of folly. | You can't get any more foolish [silly, inane] than that!

・この小説は愚劣だ. This novel is mere rubbish.

愚劣さ dim-wittedness [foolishness]; worthlessness [trivialness].