By a considerable amount, abundantly, and appreciably are all synonyms for greatly. Slightly and not at all are antonyms of greatly. And here are 31 another word for greatly.
Abundantly, appreciably, by a considerable amount, considerably, enormously, exceedingly, extremely, hugely, immensely, majorly, markedly, materially, mightily, much, plenty, profoundly, remarkably, seriously, signally, significantly, sizeably, substantially, to a great extent/degree, to a great extent, to the nth degree, tremendously, vastly, very much, well, and bigly are all synonyms for greatly.
Greatly synonym page has a variety of synonyms that differ in length. 2 synonyms with 4, 11, 12, 13, and 14 letters and 3 synonyms with 6, and 9 letters. 1 synonym with 7, 20, and 21 letters and 5 synonyms with 8, and 10 letters. For a total of 29 another word for greatly.
She appreciated your help greatly today.
The weather improved greatly this afternoon.
They benefited greatly from the experience.
His performance has improved greatly recently.