質問: how do you say this in english (us)? 悔しかった。 how do you say this in english (us)? 悔しかった。
回答: if you are saying it by itself as a response you can say, "that's so annoying!", "how annoying!", "that's so disappointing!, "what a disappointment!"or in slang "what a bummer!" it depends on the context. "annoying" is often use for things and people that irritate us. "disappointing" can be used for failures and to show displeasure. "bummer" can mean disappointment in slang.