Synonyms for Importantly:

adv

authoritatively (adverb)
autocratically, effectually, imperiously, powerfully, influentially, consequentially, arrogantly, dictatorially, effectively, masterfully, Commandingly, impressively, authoritatively.
importantly (adverb)
critically, eminently, influentially, prominently, consequentially, momentously, pivotally, noteworthily, notably, considerably, crucially.
influentially (adverb)
masterfully, influentially, motivationally, predominantly, authoritatively, supremely, prejudicially, Commandingly, powerfully.
principally (adverb)
predominantly, supremely.
substantially (adverb)
essentially, meaningfully, physically, substantially, actually, really, tangibly, immanently, significantly, considerably, materially.

adv.

above all (adverb)
mainly.
all (adverb)
significantly.
authoritatively (adverb)
autocratically, effectually, imperiously, powerfully, influentially, consequentially, arrogantly, dictatorially, effectively, masterfully, Commandingly, impressively, authoritatively.
essentially (adverb)
in essence, significantly, actually, really.
importantly (adverb)
momentously, notably, prominently, eminently, critically, pivotally, noteworthily, crucially.
influentially (adverb)
supremely, prejudicially, predominantly, motivationally.
par excellence (adverb)
superior.
principally (adverb)
materially, notably, predominantly, essentially, basically, substantially, supremely, eminently.
substantially (adverb)
essentially, meaningfully, physically, substantially, actually, really, tangibly, immanently, significantly, considerably, materially.

n.

mainly, basically, in essence, the fact (of the matter) is, not just any..., at the end of the day, first. egocentric, self-opinionated, self-satisfied, conceited, arrogant, superior, immodest, proud, vain, patronizing. importantly (noun)
significantly.

Other synonyms:

basically. first. Other relevant words:
mainly.

Usage examples for importantly

  1. Lancaster sucked his teeth importantly – The Plow-Woman by Eleanor Gates