Verb
To fail to accord; not to agree; to lack harmony; to differ; to be unlike; to be at variance.
To differ in opinion; to hold discordant views; to be at controversy; to quarrel.
To be unsuited; to have unfitness; as, medicine sometimes disagrees with the patient; food often disagrees with the stomach or the taste.
Source: Webster's dictionaryA demagogue is a person with whom we disagree as to which gang should mismanage the country. Don Marquis
You seem to think that the only genuine existence evil can have is conscious existence - that no one is evil unless he admits it to himself. I disagree. Gene Wolfe
Whether you agree with me, disagree with me, like me or loathe me, don't bind my hands when I am negotiating on behalf of the British people. John Major
Theologians, dogs, and singers always disagree. Hindi Proverb
Put to the sword those that disagree. Norse Proverb
Sometimes even the intestine and the stomach disagree. Arabic Proverb