She was resolved to be a good deal more circumspect.
W. Black.
It was formerly limited by some, every, never a, a thousand, etc.; as, some deal; but these are now obsolete or vulgar. In general, we now qualify the word with great or good, and often use it adverbially, by being understood; as, a great deal of time and pains; a great (or good) deal better or worse; that is, better by a great deal, or by a great part or difference.