そんな大切なことを忘れるとは、君はずいぶん不注意だね。
Sentence Analyzer
English Translation
        How careless you are to forget such an important thing!
    
Furigana
        そんな大切 なことを忘 れるとは、君 はずいぶん不注意 だね。
    
Romanji
        Sonna taisetsuna koto o wasureru to wa, kimi wa zuibun fuchūi da ne.
    
Words
            
                そんな
            
            
                (そんな)
            
        
        
            such (about the actions of the listener, or about ideas expressed or understood by the listener); like that; that sort of
        
    
            
                大切
            
            
                (たいせつ、たいせち)
            
        
        
            important; necessary; indispensable; beloved; precious; dear; cherished; valuable; careful
        
    
            
                事
            
            
                (こと、こん)
            
        
        
            thing; matter; incident; occurrence; event; something serious; trouble; crisis; circumstances; situation; state of affairs; work; business; affair; after an inflectable word, creates a noun phrase indicating something the speaker does not feel close to; nominalizing suffix; pretending to ...; playing make-believe ...; alias; aka; nickname; alternative name; also known as
        
    
            
                を
            
            
                (を)
            
        
        
            indicates direct object of action; indicates subject of causative expression; indicates an area traversed; indicates time (period) over which action takes place; indicates point of departure or separation of action; indicates object of desire, like, hate, etc.
        
    
            
                忘れる
            
            
                (わすれる)
            
        
        
            to forget; to leave carelessly; to be forgetful of; to forget about; to forget (an article)
        
    
            
                と
            
            
                (と)
            
        
        
            if; when; and; with; particle used for quoting (with speech, thoughts, etc.); quoting particle; promoted pawn; indicates question (sentence end)
        
    
            
                は
            
            
                (は)
            
        
        
            topic marker particle; indicates contrast with another option (stated or unstated); adds emphasis
        
    
            
                君
            
            
                (きみ)
            
        
        
            you; buddy; pal; monarch; ruler; sovereign; (one's) master
        
    
            
                随分
            
            
                (ずいぶん)
            
        
        
            very; extremely; surprisingly; considerably; contemptible; reprehensible
        
    
            
                不注意
            
            
                (ふちゅうい)
            
        
        
            carelessness; inattention; thoughtlessness
        
    
            
                だ
            
            
                (だ)
            
        
        
            be; is; indicates past or completed action; indicates light imperative
        
    
            
                ね
            
            
                (ね、ねえ)
            
        
        
            indicates emphasis, agreement, request for confirmation, etc.; is it so; hey; come on; listen; not
        
    Kanji
Readings: ダイ、 タイ、 おお-、 おお.きい、 -おお.いに
                        Meanings: large, big
                    Readings: セツ、 サイ、 き.る、 -き.る、 き.り、 -き.り、 -ぎ.り、 き.れる、 -き.れる、 き.れ、 -き.れ、 -ぎ.れ
                        Meanings: cut, cutoff, be sharp
                    Readings: ボウ、 わす.れる
                        Meaning: forget
                    Readings: クン、 きみ、 -ぎみ
                        Meanings: mister, you, ruler, male name suffix
                    Readings: フ、 ブ
                        Meanings: negative, non-, bad, ugly, clumsy
                    Readings: チュウ、 そそ.ぐ、 さ.す、 つ.ぐ
                        Meanings: pour, irrigate, shed (tears), flow into, concentrate on, notes, comment, annotate
                    Reading: イ
                        Meanings: idea, mind, heart, taste, thought, desire, care, liking