na-adjective, noun
injustice; impropriety; unreasonableness
Refers to something being unfair, improper, or unreasonable, often in a formal or legal context. Used as a noun or adjectival noun.
その判決は失当だという批判がある。
There is criticism that the ruling is unjust.
彼の要求は失当なものだった。
His demand was unreasonable.