Synonyms for Greatly:

adv

awfully (adverb)
hugely.
largely (adverb)
majestically, generously, gigantically, grandly, massively, comprehensively, expansively, largely, copiously, magnificently, extensively, princely, toweringly, grandiosely, impressively, hugely, capaciously, amply, voluminously, sizably, loftily, spaciously.
nobly (adverb)
imperially, regally, magisterially, heroically, imposingly, majestically, dignifiedly, nobly, Augustly, Sovereignly, royally, aristocratically, grandly.
sizably (adverb)
highly, dimensionally, magnificently, widely, expansively, Corpulently, extensively, largely, voluminously, chunkily, sizably, broadly.
sufficiently (adverb)
well.

adv.

awfully (adverb)
extremely.
considerably (adverb)
highly, notably, indeed, eminently, extremely, largely, most, exceptionally, exceedingly, hugely.
extremely (adverb)
very.
highly (adverb)
highly.
largely (adverb)
majestically, generously, gigantically, grandly, massively, comprehensively, expansively, largely, copiously, magnificently, extensively, princely, toweringly, grandiosely, impressively, hugely, capaciously, amply, voluminously, sizably, loftily, spaciously.
nobly (adverb)
imposingly, regally, nobly, Sovereignly, royally, Augustly, imperially, magisterially, dignifiedly, heroically, aristocratically.
sizably (adverb)
broadly, Corpulently, widely, highly, dimensionally, chunkily.

n.

deeply, a lot, thoroughly, well, indeed. dreadfully, extremely, exceedingly, big, eminently, exceptionally, very, extra, most, notably, mighty, awful, awfully. exceedingly (noun)
considerably, very.

Other synonyms:

considerably, dreadfully. exceedingly, extremely, notably, eminently. deeply, exceptionally, thoroughly, awfully. extra. indeed, mighty. well. Other relevant words:
dreadfully, well, notably, mighty, very, considerably, deeply, exceedingly, indeed, extra, awful, thoroughly, exceptionally, awfully, big, most, eminently, extremely.

Usage examples for greatly

  1. I felt greatly interested in them all. – The Memoires of Casanova, Complete The Rare Unabridged London Edition Of 1894, plus An Unpublished Chapter of History, By Arthur Symons by Jacques Casanova de Seingalt
  2. Do you greatly object to my sleeping during that time?" – The Rebel of the School by Mrs. L. T. Meade
  3. She was thoroughly sorry, and greatly ashamed; and she only gasped out, " I can't, I can't; don't let me see anyone." – Countess Kate by Charlotte M. Yonge