Question

Sincerity is a great virtue in which sincerity is an abstract noun

Answer 1

That is a correct grammar analysis.

Answer 2

Answer:

Sincerity is a great virtue.

'Sincerity' and 'virtue' are the abstract nouns in the above sentence.

Explanation:

[Abstract nouns belong to a type of nouns which are intangible. The things which we can not touch or see but can only be felt are known as abstract nouns. They tell about the idea, quality, state, concept or feeling which can only be felt and not touched or seen through sense organs. ]