Yes, it is.
Yes, it is possible to start a sentence with the word "disagreeing." For example: Disagreeing is not always the best answer. Disagreeing is all you two do. Disagreeing is when two people can not make a common choice.
disagreeing
The noun form for the verbs disagree or disagreeing is disagreement.
The correct spelling is "argument" (a debate or disagreement).
Disagreeing indirectly is when you don't think what a person says is right but don't want to say it outright.
The opposite of agreeing is disagreeing.
Not really, if you don't mean any disrespect from your decision, than it is merely disagreeing without any offense intended.
The opposite of agreeing is disagreeing.
Other words for Argue: Quarrel (Quarreling), Disagree (disagreeing), Squabble (squabbling), Bicker (bickering), Fight (fighting), Dispute (disputing), Altercate (altercation)
No, it's a personality trait
improvements of the idea
Not the person; or something cruel, for people to love; or life first, work second