noun
foolish idea; poor plan
Used to criticize or dismiss an idea as ill-conceived or unwise. Not necessarily humble; can be used about others' ideas.
そんな愚案はすぐに却下された。
Such a foolish idea was immediately rejected.
noun
my humble idea; my humble opinion
Humble expression used to refer to one's own idea or opinion modestly. Often used in formal or self-deprecating contexts.
私の愚案ですが、この方法はいかがでしょうか。
This is just my humble idea, but what do you think of this method?