Is it correct to use "much" with "delighted"? It sounds alright to me, just want to confirm.
This is grammatically correct - you are using
much as an adverb in its sense of
to a great extent or degree; greatly
The phrasing is not the most common phrasing, according to my American ear - I would expect to hear
very delighted instead - but it also doesn't sound wrong.
He was much delighted to receive the news.
The use of the adverb much in front of the adjective delighted is far more common than "very". According to the Longman dictionary, we shouldn't use the very before the delighted.
Moreover, some adverbs that also go with the delighted are greatly, quite, extremely, but the use of the "delighted" that means extremely pleased is most common without an adverb before it.