Why have you been single since birth?
a. I don't want more responsibility.
b. I don't want more responsibilities.
Would you tell me which is a felicitous remark?
Dictionaries just say responsibility is a variable noun (uncountable, countable).
Either one is ok. This is better: I don't want to take on the responsibility of a marriage / family.
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Either one is ok.
This is better:
I don't want to take on the responsibility of a marriage / family.