suru verb (special), intransitive verb
be contrary to; go against; contradict
Used when something conflicts with expectations, rules, principles, or another statement. Often appears as ～に反する.
彼の行動は規則に反する。
His actions go against the rules.
その噂は事実に反
That rumor contradicts the facts.
suru verb (special), intransitive verb
Specifically for breaking laws, agreements, or formal rules. Stronger than sense 1.
その行為は法律に反する。
That act violates the law.
suru verb (special), intransitive verb
Used for defying orders, teachings, or authority. The kanji 叛する is sometimes used for this sense.
生徒は先生の指示に反した。
The student disobeyed the teacher's instructions.
彼は親の教えに反して家を出た。
He left home against his parents' teachings.