先生に対して失礼なことを言いました。

N5 先生 sensei teacher N4 失礼 shitsurei impoliteness, discourtesy, excuse me

N5 先 sen / saki, ma.zu before, ahead, previous N5 生 sei, shou / i.kiru, i.kasu, i.keru, u.mareru, uma.reru, u.mare, umare, u.mu, o.u, ha.eru, ha.yasu, ki, nama, nama-, na.ru, na.su, mu.su, -u life, genuine, birth N3 対 tai, tsui / aite, kota.eru, soro.i, tsurea.i, nara.bu, muka.u vis-a-vis, opposite, even N3 失 shitsu / ushina.u, u.seru lose, error, fault N3 礼 rei, rai salute, bow, ceremony N4 言 gen, gon / i.u, koto say, word, dire

N4 〜に対して ni taishite Indicates target, direction, attitude, or contrast toward something, attaches to a noun, means toward, against, or in relation to N5 〜ます masu Used at the end of verbs, polite present or future form, makes the sentence more polite N4 〜し shi Indicates multiple reasons or qualities, connects clauses or adjectives, means besides that, and also N5 〜を o Marks the direct object of an action, appears before the verb, shows what receives the action N5 〜に ni Indicates destination, target, arrival point, specific time, or person receiving an action N5 〜と to Indicates company, quotation, natural condition, complete list, or direct connection between elements