Present, Future 悔しい is [x] 悔しくない is not [x] Past 悔しかった was [x] 悔しくなかった was not [x] Te-form, Continuative 悔しくて is [x] and... 悔しくなくて is not [x] and... Provisional 悔しければ if it is [x] 悔しくなければ if it is not [x] Conditional 悔しかったら when/if it is [x] 悔しくなかったら when/if it is not [x] Adverbial 悔しく [x]-ly Noun form 悔しさ [x]-ness