Synonyms for Lastly:

adv.

finally (adverb)
decisively, conclusively.
in the end (adverb)
finally, last, in conclusion.
lastly (adverb)
completely, terminally, finally.

adv

beyond any doubt (adverb)
finally.
finally (adverb)
conclusively, in conclusion, decisively, finally.
lastly (adverb)
completely, terminally, finally.

n.

last but not least, Et cetera, and so on/forth, ...or something (like that), firstly, second, to begin with, secondly, thirdly. in conclusion (noun)
start.
lastly (noun)
finally, last, in conclusion.

Other synonyms:

secondly, Et cetera, thirdly. second. Other relevant words:
last, thirdly, second, in conclusion, secondly, start.

Usage examples for lastly

  1. Lastly A Fair Quarrel must be mentioned, because of the very high praise which it has received from Lamb and others. – A History of English Literature Elizabethan Literature by George Saintsbury
  2. Lastly if possible, I wished to avoid firing because of the report. – Allan and the Holy Flower by H. Rider Haggard
  3. His wealth, in the first place; secondly, his charity; and lastly his cunning. – The Progressionists, and Angela. by Conrad von Bolanden