a great deal better
fixed phr..fixed phr.. much better or significantly improved. You use this when you want to emphasize that the difference is quite large.
fixed phr.. an adverbial phrase of degree used to modify the comparative adjective 'better'; functions as an emphatic intensifier.
I feel a great deal better after sleeping.
The new software works a great deal better than the old version we used last year.
The patient's condition is a great deal better today, though the medical staff remains cautious about the long-term prognosis.
more formal than 'a lot better' but less formal than 'significantly better'.
highlight that 'a great deal' acts as a single unit of intensification; it can also modify other comparative adjectives like 'more expensive' or 'faster'.
a great deal besta great deal betterthe intensifier 'a great deal' must be followed by a comparative adjective, not a superlative.