生涯で一番の間違いです。
Sentence Analyzer
English Translation
        It was the biggest mistake of my life.
    
Furigana
Romanji
        Shōgai de ichiban no machigai desu.
    
Words
            
                生涯
            
            
                (しょうがい)
            
        
        
            one's lifetime (i.e. one's existence until death); one's career
        
    
            
                で
            
            
                (で、にて)
            
        
        
            indicates location of action; at; in; indicates time of action; indicates means of action; cause of effect; by; and then; so; indicates continuing action; indicates certainty, emphasis, etc.
        
    
            
                一番
            
            
                (いちばん)
            
        
        
            number one; first; first place; best; most; game; round; bout; as a test; as an experiment; by way of experiment; by way of trial; tentatively; song (e.g. in Noh); piece
        
    
            
                の
            
            
                (の)
            
        
        
            indicates possessive; nominalizes verbs and adjectives; substitutes for "ga" in subordinate phrases; (at sentence-end, falling tone) indicates a confident conclusion; (at sentence-end) indicates emotional emphasis; (at sentence-end, rising tone) indicates question
        
    
            
                間違い
            
            
                (まちがい)
            
        
        
            mistake; error; blunder; accident; mishap; trouble; improper conduct (e.g. between man and woman); indiscretion
        
    
            
                です
            
            
                (です)
            
        
        
            be; is
        
    Kanji
Readings: セイ、 ショウ、 い.きる、 い.かす、 い.ける、 う.まれる、 うま.れる、 う.まれ、 うまれ、 う.む、 お.う、 は.える、 は.やす、 き、 なま、 なま-、 な.る、 な.す、 む.す、 -う
                        Meanings: life, genuine, birth
                    Readings: ガイ、 はて
                        Meanings: horizon, shore, limit, bound
                    Readings: イチ、 イツ、 ひと-、 ひと.つ
                        Meanings: one, one radical (no.1)
                    Readings: バン、 つが.い
                        Meanings: turn, number in a series
                    Readings: カン、 ケン、 あいだ、 ま、 あい
                        Meanings: interval, space
                    Readings: イ、 ちが.う、 ちが.い、 ちが.える、 -ちが.える、 たが.う、 たが.える
                        Meanings: difference, differ