used after very and an adjective or adverb to emphasize a statement, description, etc.

used to emphasize a positive statement or answer

‘Was he very angry?’ ‘Indeed he was.’

‘Do you agree?’ ‘Indeed I do/Yes, indeed.’

‘You said you'd help?’ ‘I did indeed—yes.’

It is indeed a remarkable achievement.

I don't mind at all. Indeed, I would be delighted to help.

Today's youth live in a more affluent society than their grandparents, indeed even their parents.

used to show that you are surprised at something or that you find something silly

A ghost indeed! I've never heard anything so silly.

used when you are repeating a question that somebody has just asked and showing that you do not know the answer

‘Why did he do it?’ ‘Why indeed?’

LEARNit Dictionary