Synonyms for Substantially:

adv.

mainly (adverb)
mainly, largely.
materially (adverb)
Corporeally.
solidly (adverb)
densely, concretely, firmly, solidly, stably.
substantially (adverb)
considerably, materially, immanently, meaningfully, really, physically, importantly, significantly, essentially, tangibly, actually.
to a large extent (adverb)
essentially, mainly, considerably, heavily, largely, really, materially, extensively, much.

adv

heavily (adverb)
much, heavily, largely, extensively.
materially (adverb)
Corporeally, physically, tangibly, materially.
principally (adverb)
importantly.
solidly (adverb)
densely, firmly, physically, solidly, concretely, stably.
substantially (adverb)
considerably, materially, immanently, meaningfully, really, physically, importantly, significantly, essentially, tangibly, actually.
sufficiently (adverb)
well.

n.

big, high, considerable, widely, great, extensive, enormous, substantial, huge, large. basic, predominant, chief, supreme, main, leading, elementary, principal, primary, prime. durable, strong, heavy-duty, solid as a rock, solid, robust, irresistible, tough, stubborn, sturdy. essentially (noun)
mainly.
heavily (noun)
extensively, considerably, heavily, largely, much.
substantially (noun)
well, considerably.

Other synonyms:

adv
considerably, essentially, firmly, materially, significantly, solidly.

Usage examples for substantially

  1. The total of this study will show that the development, as such, not only first substantially showed itself, but had its complete genesis, about the year 1880. It is plain that in order to present, however, the conclusions of students who have believed they discerned signs of it in earlier years, it is necessary to include in these preliminary pages much that will not appear as fact exhibit, but rather as opinion. – The Rise of Cotton Mills in the South by Broadus Mitchell
  2. You really find it substantially better to walk with? – Delia Blanchflower by Mrs. Humphry Ward