Synonyms of substantially in English:

substantially


See definition of substantially

adverb

1‘the cost of oil imports has fallen substantially’

SYNONYMS
considerably, significantly, greatly, a great deal, to a great extent, to a large extent, to a marked extent, markedly, appreciably
ANTONYMS

slightly

2‘the draft statement was substantially accepted by the executive’

SYNONYMS
largely, for the most part, by and large, on the whole, almost entirely, in the main, mainly, in effect, in essence, essentially, materially, basically, fundamentally, to all intents and purposes, to a great degree