Synonyms of firstly in English:

firstly


See US English definition of firstly

See UK English definition of firstly

adverb

1‘firstly, I will discuss the plus points’

SYNONYMS
first, first of all, in the first place, before anything else
first and foremost, essentially, in essence, fundamentally, most importantly, primarily, principally, predominantly, predominately, basically, elementally, above all, especially, particularly